Many people have wondered about what the phrase "balance of the Force" means when referring to Anakin, although many speculate that it's how he wipes out the last of the Sith. This was in Mace Windu's databank entry: Reversals such as these troubled Master Windu, for they came about too suddenly, and the usually prescient Jedi were unprepared. Something was clouding the future, and the order's very connection to the Force was weakening. That a Sith Lord existed, somewhere in the galaxy, was not in doubt, but could this shadowy villain really bring this much imbalance to the Force? I take this to mean that by eliminating the Sith, the Jedi can once again regain control of their connection to the Force. That being said, yes, I would say that Anakin is the balance of the Force because he "kills" Vader and Palpatine, the last of the Sith.