RicOlie_2 said:

I think you're in the wrong thread. ;)

First of all, ^ this. If you are convinced the prequels cannot be done without spoilers, simply say so and just let us have our fun by brainstorming. :)

Secondly, I agree with Sunrider101. We need that "second apprentice" character to allow Obi-Wan to maintain some credibility in the OT. The culmination of Anakin being seduced by the Dark Side happens when, in a final showdown with "Xanatos", he lets his anger take over so that he can win the battle. After he survives, he realizes that anger and hatred are the only way to truly gain victory. We don't see who wins, but Palpatine taunts him the same way he taunts Luke in RotJ. We see the hatred on Anakin's face before they both fall from view. Then Obi-Wan's explanation to Luke in RotJ still makes sense.

As far as central vs secondary characters, Anakin would still be a central character, but the story would just be told more from Obi-Wan's point of view. Kind of like Professor X and Magneto in X-Men First Class.