The Cleveland Cavaliers went through this exact thing just last season. When it came to the playoffs, they had too many big men so Mike Brown was forced to pick and choose which big men to play...and in the series against the Cs, what were people saying? "Where's J.J. Hickson?, Why aren't you playing Hickson more?"
If Sheed comes back, I can picture an overload and maybe the same thing happening...I mean, look at who we'll have at the start of the playoffs...
Perk, Shaq, Jermaine O'Neal, Big Baby, Harangody, AND Rasheed.
Obviously take Harangody off that list for playoff big men, but then you still have the other 5...and in the playoffs Doc will probably have a 10 man rotation at most.
None of this may happen, but I realistically see a problem brewing in terms of playing time and people wanting to get into the game.