Jedi Master Obi Wan Kenobi

Jedi Master Obi-Wan wasn't all that strong. He was easily defeated by Count Dooku and Yoda stated that he wasn't strong enough to even challenge Sidious. He also struggled considerably against Grievous, only winning when he abandoned his Jedi tactics and used a blaster. While he did manage to defeat Anakin, it was more because of superior strategy than superior skill or power. They seemed fairly evenly matched throughout the battle, though, so strategy was almost certainly going to be the deciding factor in that fight.

As such, if such a character were to be placed in the game, his power should be roughly equal to that of Anakin's, which I'm assuming is not what you had in mind.