Not really. That's never a possibility. Return of the Jedi makes that painfully clear. Palps wanted Luke to kill Vader. Palps was fully prepared to let Vader kill Luke. There would never be a possibility of a Evil trinity no matter how you tweaked the prequels.>>
If that was never a possibility, Vader wouldn't have blocked Luke's swing at the Emperor.
WHAM! Sidious is dead, Vader is Emperor, and Luke has turned to the dark side.
Vader seemed to be under the impression that there were going to be three of them, even if it did turn out that Palpatine did intend to repay Vader's betrayal in ESB with one of his own.
>>Also, I think your switch from Dooku DEFINITELY being a sith to being some kind of "maybe-bad-guy/Dark Jedi" easily kneecaps the entire point of the character at the least, and simply makes the mystery about him redundant as well, especially considering his role in Episode III. You have to have his vagueness wrapped up in Episode II, otherwise it creates problems for Episode III. The Yellow Saber ruins that. Hell, it factors into that Return of the Jedi climax as much as anything else--Palpatine's ability to turn Dooku and get him to resign from the Jedi is a main reason he smiles and grins at Vader for suggesting he can turn Luke. you take that away from Dooku by giving him a yellow saber and not outright making him a sith, you completely weaken not only the ESB scene, but the force behind Palpatine's taunts in ROTJ.
The change doesn't kneecap the character at all.
That one scene kneecapped the entire film in Episode II. It took what could have been an interesting cliffhanger mystery and spoonfed you the answer before it was in any way necessary.
It would have been like having Yoda tell Luke that Vader was his father at the end of ESB instead of in Jedi. People argued for three years after ESB that Vader was a liar and not really Luke's father, or that he was a clone of Luke's father, until Jedi resolved it definitely. I have several old magazines from then with articles debating it.
Also, it can still easily be revealed that Dooku is a Sith in Episode III, if I decide to make him one. Likewise, it could just as easily be removed altogether.
It in no way effects the scene in ESB, other than removing contradictory information.
If there were a rule of two in place in Jedi, Vader would have agreed to kill Luke, then hidden him from the Emperor and tried to turn him... and he certainly would NEVER have taken an unturned Luke before the Emperor in Jedi. If Dooku were a Sith, and we know how he ends up in III, Vader wouldn't need to be a rocket scientist to see how that was going to end up.
Also, the Emperor's taunts are totally irrelevant to any of the changes I made. You won't really see how much they mirror a scene in the Prequels until EP III, and its Anakin who is on the recieving end of the taunting then.