I think both health and fit are legit questions with him. We know the Kings' defense was atrocious. The road to respectability, much less perennial playoff participation or championship contention, is largely about making leaps and bounds on the defensive side. The Kings' defensive woes clearly don't reduce to MB's liabilities, but, right now, whether at the 4 or 5 he hurts you; you have to talk about a complementary player (or players) along the front line.
Even offensively it's tricky. OOH, he shot 34.3% from 3. Not great, but not bad (2 pts better than DFox), and trending upward. But he's clearly more comfortable and effective down low, meaning, as LPKingsFan says, the ideal fit with him is a defensive anchor w/a 3-ball - Jaren Jackson w/better rebounding skills. (Dedmon was supposed to offer some of that, but...)
Not easy.