Echuu-Shen Jon was a brilliant swordsman, trained by Master Windu himself. Shaak Ti is quite adept herself, but I think Master Jon would be more skilled than her. Though, she does sit on the Council...
Echuu-Shen Jon was not present for Order 66. He imposed himself into isolation on the planet that he kill Tann on, and was not heard from again until the Rebellion stumbled across him.
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Why not? Lucas says so himself. Vader is horrifically crippled after his beating on Mustafar. He is worse than ROTS Anakin Skywalker. His force abilities are somewhat crippled considering the amount of flesh (and therefore midichlorians) that he lost.
Grievous was cripple too, but I haven't seen Shaak Ti defeat him without any effort. I think Vaders suit is better than Grievous his one, because the new technologies and because Vader was a Dark Lord and had to get a very good suit. (of course Sidious wanted the best for his apprentice) Plus the fact Vader can use the force.
He would destroy Shaak Ti just like Echuu.
Yeah, I think it's obvious that Vaders suit strengthened him to a very high degree thus allowing him to fight off opponents much more effectively. Of course he's crippled but it's science fiction, his suit actually gave him at least some advantages..
And no Traya, I won't deal with this dumb general assumption of that he's weak as I don't accept prejudice. I will change my mind with proper arguments though.
1. C-3PO wasent a target of the Empire, they didn't care a crap about him.
2. He wasent alone, surviving, he had alot of help and was around people all the time.
Still I agree with your point, surviving the purge is really nothing to go on here, it doesent exactly indicate uber power.
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Lightsaber wise, Vader would still be better than ROTS Anakin.
OT Vader completed the training of Sidious and he perfected his lightsaber fighting style and became a master duellist, ROTS Anakin would never be able to defeat himself with so much more experience.
Of course there are major dissadvantages for wearing such a suit because otherwise everybody in the empire would get one but Vader (although with less force potential) overcame them and became a masterduellist in his own right. ROTS Vader was far from it, he couldn't even keep a cool head in battles.