So Palpatine's pre-Vader apprentice has a personality of his/her own? It sounds better than Lucas' tripe already.

My draft has the leader of the clones revealed to be a Jedi who turned against the order two years before the events of Episode I. On her way out, she fought Anakin and his apprentice. The two Jedi battled her with tenacity but ultimately the traitor bested them both by killing the apprentice and slicing off Anakin's hand.

Anakin's drive for vengeance is a key factor in his dark side conversion process. This dark Jedi becomes Anakin's white whale. But in killing his white whale, Anakin becomes the monster he tried to destroy.