As I've said, I think there's a good to strong chance Keller surpasses Marsh in the rotation. Keller was raw and not strong enough as a freshman, which is very often the case for freshman bigs. He has a perimeter game and decent post fundamentals, neither of which Marsh has, and he has lateral mobility on defense, which Marsh hasn't shown. I think the likelihood of Keller adding a few pounds and gaining confidence in year 2 is far higher than the likelihood of Marsh overcoming apparent athletic limitations in year 3. Assuming we add a competent big, I think the rotation is as follows:
Guards: Boopie, Jao, Cam, Parker
Wings: Bobi, Sallis, Damari
Bigs: Carr, transfer, Keller