I just uhhh want to share somethin about Galen's two most famous feats.
Pulling down the Star Destroyer and beating Sidious.
Except, he didn't pull down a Star Destroyer, he guided an already falling Star Destroyer down and he collapsed from exhaustion right after.
Kota’s voice unexpectedly came in reply. “What’s going on, boy?”
Can’t you see it, he wanted to say, then realized who he was talking to. He described the scene in as few words as he could, unable to tear his gaze away from the sight of the disintegrating shipyards. Huge, molten chunks were tearing free and tumbling either out into deep space or down into lower orbits while further explosions continued to tear the facility apart. The scaffolding around the nearly completed Star Destroyer had bent and torn completely away, leaving the ship free to power down into the atmosphere of Raxus Prime. Already it was visible as a distinct triangle glowing orange around its leading edges and conning tower. It was coming directly toward him.
It was aiming for him.
“Juno can’t fly the ship at the moment,” said Kota firmly, “and neither can PROXY. We have to find another solution.”
“What’s wrong with Juno?”
“Concentrate on what’s important, boy. That Star Destroyer is coming down fast. You’ll never get clear in time. You need to pull it into the cannon.”
The apprentice was temporarily lost for words when he realized what Kota was suggesting.
Kota wanted him to move the Star Destroyer using nothing but the Force.
“You’re insane,” he gasped. “It’s massive!”
“What is mass?” Kota said. “It’s all in your mind, boy. You’re a Jedi! Size means nothing to you!”
Kota’s voice had changed. The surly, drunken slur was completely absent; in its place was the durasteel bark of the seasoned combat veteran the apprentice had first met.
“Can you hear me, boy? Reach out and grab that ship, or you’ll die on this trash heap!”
The Star Destroyer was growing visibly larger and hung like a burning, triangular moon low in the sky of Raxus Prime.
You’re a Jedi! Size means nothing to you!
He wasn’t a Jedi but the message was the same. The Force didn’t recognize big or small, heavy or light, hard or easy. The living flows of the galaxy encompassed all scales, from the very small to the extremely large. The Star Destroyer was part of it, and so was he. The Force bound them as surely as gravity. He could make its invisible muscles flex, if he dared.
Had his Master ever done anything like this? Had the Emperor? Had any Sith or Jedi in the history of the galaxy?
He doubted anyone would ever know about his success or failure in the next few minutes.
“Be quick about it, boy!”
Fast or slow were also irrelevant to the Force, but the apprentice took Kota’s point. The sooner he started, the sooner it would be done.
Deactivating his lightsaber and attaching the hilt to his belt, he adopted the opening stance of the Soresu form, with his right arm and fingers outstretched, pointing at the Star Destroyer. His empty left hand he tucked in next to his heart. With his legs braced firmly in the trash, he reached as deep as he had ever reached into the Force, and then went farther still, feeling as though a mighty chasm had opened up under him and his mind and will plunged down into it. The chasm filled. His mind opened. The physical existence of the Star Destroyer slid painlessly inside.
Nearly sixteen hundred meters long and capable of carrying a crew in excess of thirty-seven thousand, the ship was a familiar design. Its engines and armament weren’t fully installed, but its Class One hyperdrive would have taken it anywhere in the Empire at speed, there to deploy walkers, fighters, barges, and shuttles. Armed with a host of turbolaser and ion cannons, plus no less than ten tractor beams, it could have blockaded an entire system on its own. The reinforced durasteel hull was solid enough to rip a gouge in Raxus Prime that might take centuries to fill. Scavenger droids would have a field day when it came down.
Wherever it went down …
There is no wherever, he told himself. There is only where I tell it to.
Focus.
The tip of his right index finger and the Star Destroyer became as one in his mind. Every nut and bolt and plate and wire of the massive machine was contained within that tiny space. It wasn’t hard to move an arm, a finger, a single human cell. He could direct one barely without thinking, so why not the other, too? Instinct was clearer on that point than the workings of his mind. Ignoring perspective, the two were about the same size in his field of vision.
Except the Star Destroyer was growing larger with each passing second, and waves of TIE fighters and TIE bombers were pouring forth from its brand-new hangar decks. Laserfire cut huge super-hot channels through the atmosphere ahead of them.
The apprentice ignored it all. While the illusion held, he moved his hand a very slight distance to his right. The sensation of containing a vast, million-ton machine in the tip of one finger was deeply disorienting. He felt as though every muscle fiber, nerve, and bone groaned along with the metal seams and joints of the ship. What it felt, he felt, too, and even a small acceleration had a profound effect on such a large scale. It resisted with all the momentum it possessed. Hatches swang open; rivets popped; bulkheads twisted; pipes burst.
The Star Destroyer didn’t appear to have moved much in the sky. It was still coming in low on the horizon, aiming to pass over him and strafe him from above. He shifted his hand a second time, but instead of changing its course he mistakenly gave it a slight tumble. He needed to apply the Force the right way for this to work, taking the growing forces of friction and the shifting of its center of gravity into account. A spinning Star Destroyer would do more damage than one burying itself nose-first into the cannon and its superstructure. Damage was good, when it came to destroying the Emperor’s handiwork, but too much damage could destroy him and perhaps the Rogue Shadow as well under a deadly rain of molten shrapnel.
Bring it down in one piece, he told himself. Bring it down hard.
The ship growled and squealed in metal torment. He was getting the hang of it; he could see how its course was slowly shifting. As wide across as his outstretched hand now, it was hitting the atmosphere at a steeper angle than he had intended, burning bright red and already gouting a trail of black smoke and sparkling debris. He became aware of a sound communicated through his feet: a rumbling much deeper and more sustained than the pounding of the cannon, which had fallen silent after the firing of the third projectile. The Star Destroyer’s incomplete frame was acting like a giant tube, and the atmosphere was resonating inside. His whole body sang with it.
More. The Star Destroyer was really picking up speed now. The thickening atmosphere had a slight braking effect, but nothing could prevent the inevitable. It was going to hit soon. A wild exodus of droids ran past him, fleeing the crash site. The TIE fighters it had launched raced ahead of the chaotic atmospheric waves it generated. He ignored them and concentrated on shifting ground zero as close to the cannon as he could.
Sparks danced in front of his eyes. The edges of his vision faded to black. Light and dark swirls spun around him, wraith-like. He felt momentarily faint and wondered if it was possible to dissolve into the Force. He was a speck caught in the updraft over a forest fire—yet somehow he had the audacity to try to command the fire to do his will.
Who did he think he was?
A sudden panic almost made him lose control. The Star Destroyer, now a burning, shrieking meteor, filled his entire forward vision. The hull was peeling away in fiery, golden strips, each one weighing hundreds of tons, exposing the darker skeleton beneath. It looked like a death’s-head, a ghastly mask not dissimilar to his Master’s, but one molten like lava. This could well be the end of everything, he thought distantly. Of him, of his plans, of his feelings for Juno, and of the boy called Galen who had lost a father a long time ago and whose grief had already been effectively erased.
But his name had survived, and names had power. The apprentice clutched at it with desperation, needing to regain control of the Star Destroyer lest it tear itself apart and disperse the impact. He needed to find his focus again, to ignore the feeling of dissolution eating at the edges of his self, and to tip the balance of power back toward him.
Galen had stood up to Darth Vader as little more than a child. Galen had wrested the lightsaber from a Dark Lord of the Sith and stood bravely in the face of death. Galen may have been ground down by years of training and darkness since, but was he truly gone—or had he just gone into hiding until the opportunity came to emerge back into the light?
Are you there, Galen? I need your help!
No answer came.
The Star Destroyer’s catastrophic reentry made the world shake. There was no time to try again.
For Juno, then.
He gritted his teeth and snarled at the sky. The dead weight of the Star Destroyer shifted one last time, changing its angle of descent just enough to hang together those last few hundred meters, but not enough to risk bouncing. Only seconds remained before it hit and it was still getting bigger. It was impossible that the sky could contain so much metal!
Abandoning his control over the ship, knowing there was nothing now that he could do to alter its course, the apprentice staggered backward, dazed. The Force fled from him, leaving him wrung out and drained. With a sound like the world ending, the Star Destroyer completed its first and final journey. It hit the cannon, exactly as it was supposed to, and the sky turned white. The ground buckled beneath the apprentice’s feet. He pinwheeled, unable to find his balance, as a tsunami of junk and waste rose up ahead of him and blotted out the sun.
- The Force Unleashed Novel
As for beating Sidious....well they never 'really' fought.
"Help him!"
Bail Organa's voice snapped the apprentice out of his trance. He shook his head, feeling the Emperor's influence sliding off him like oil. What had he been thinking? He didn't want to return to the dark side after everything he had been through. He had seen what it did, in Maris Brood, on Felucia, and in the eyes of Darth Vader. He didn't even want to kill his Master, now that he saw him humbled and at his mercy. That was where it had all started, he now realized. When Darth Vader had killed Galen's father and Galen had snatched the lightsaber from his hand, his intention had been solely to avenge his father's death. That had been what Vader had seen in him all those years ago, not just that he was strong with the Force-and that was why Galen had blotted out the person he had once been. He had taken that first step down the path of the dark side all on his own, before he had been subjected to Vader's cruel tutelage. He had to retract it now or submit to the dark side forever.
Murdering Darth Vader would accomplish nothing. Saving his friends might change the course of history.
Seen in that light, the decision was surprisingly easy.
A hail of shattered transparisteel and debris drove the Emperor back from Kota, breaking his concentration and freeing the Jedi Master from the fatal web of energy. Smoking and weak, Kota fell away and was caught by Garm Bel Iblis. The apprentice tossed them the comlink and advanced on Palpatine. "Good," hissed the Emperor, his claw-like hands upraised between them like a weak old man fending off an attacker. Stumbling, he fell to his knees. "Yes." He looked up at the apprentice. "You were destined to destroy me. Do it! Give in to your hatred!"
-The Force Unleashed Novel
The Novel and game makes it clear Palpatine threw the 'fight' as well. Notice how after the whole exchange Palpatine is unscathed and Galen is dead.
Beating Vader is nice, but numerous sources tells us that at the time of ANH, Vader was a shell of his former self and got much stronger during ESB/ROTJ.
TFU took place before ANH.
At first glance, I can safely say that Ventress has better dueling skill and physical abilities, however Galen is more powerful.
If they're both fighting at their best, Ventress wins. The problem is though, Ventress is very inconsistent when it comes to fighting. One minute she'll force Mace Windu to "use all of his skills to defeat her" and the next she'll be getting stomped by Count Dooku.
So it could honestly go either way.
