The answer is definitely Amir Johnson in my opinion.
He's a decent player and still young but not worth the money were paying him for the production he gives the team. I know he does a lot of things that don't show up on the stat sheet but pretty soon he'll be coming off the bench once Jonas Valincunas arrives and becomes more seasoned. I still like Ed Davis much better as well as a back up PF. The things Amir does, even Aaron Gray could make up if we were too amnesty Amir who highly doubt teams would trade for because of his contract.