Our bigs are subpar, we have too many bigs that are rooted to the floor, slow footed, poor defenders, and soft. All do one thing fairly well, and many things poorly.
If fact, all of them should be coming off the bench. Kelly needs to see the Wizard of Oz, to find some steady confidence. Lee has no future with this team at all. Sully, while having no real position, will never play an entire season without injury or conditioning issues. Zeller is an ok backup center nothing more, Amir is an ok PF, sometimes playing aggressively, sometimes just disappearing. Mickey has good potential, he runs the floor, defends, protects the rim, he's athletic and very long, and is beginning to show signs of some scoring potential. He needs more minutes, in Maine, and Boston.
The fact is, it really doesn't matter who starts.