As I said before, Samuel Jackson should not have been Mace, he should have been a wild Jedi Knight who often borders on the Dark Side, but never turns. Who challenges Anakin's rise in the order and dislikes Obi Wan's ways. Generally disagrees with the ideas of the council. Essentially, he is the first one that the Council would guess is likely to turn, but is actually more devoted than even they can imagine, just skirts the rules to achieve a light side victory at times. In the end, his character could have been found to be the ONLY one who seemed to know Anakin would turn and is finally the last chance for the Jedi Order, but loses to Darth Vader in a badass fight. Why I'd make him merely a Jedi Knight? Easy, because he would never be tied down to the Jedi Council. There could be a whole comic book line of his adventures and getting dicplinary actions from the Council for his "bad" decisions. That's just always the way I imagined it.