I never once believed that more money=better film.
Part of Jedi's problem is popularity and story threads. You can't not go and get Han sometime during the storyline of Episode VI. You can't not find out if Vader truly is Luke's father. You can't have the Rebels not pursue the final battle with the Empire. Those threads need to be closed.
But back to Anakin, his idea that the Jedi are greedy and evil has more to do with the fact that it's the Dark Side dominating him for than having two versions of Episode III. His dialogue means squat because he's obviously out of control and dominated by the Dark Side of the Force. Hell, Anakin and Obi-Wan's dialogue while lava surfing was part of reshoots where he refilmed Anakin's turn...
zombie is partly right that Lucas had two different versions but he makes it work with the idea of the Dark Side dominating Anakin's actions and words. That's the reason he lost that fight with Obi-Wan. It had nothing to do with Obi-Wan being better.
As for having the turn set in stone, he had it when he started shooting. He just rethought the idea.