I've said this again and again but no one seems to listen 
There is no way that Perk is back in 5 to 6 months. He just underwent surgery. If his ACL is fully torn, he is back late March at the earliest.
And the way that Perkins plays, he uses his lower body strength to keep players from backing him down/the way he goes up to finish, there's no way he's going to be back to normal.
While we can hope that Perk has a speedy recovery, he probably isn't going to be the same Perk we're used to seeing. There's a chance he doesn't even return at all next season.
We need another big. If KG, JO, or BBD go down, we're down to ZERO legitimate backups. I like Harangody, but I don't think he can play center. If we bring back Sheed, that's fine. If we can pick up another big like Shaq, that's also fine.
People have this illusion that the Celtics have a logjam at center, we don't. Until we know more on Perk, Celtics management needs to prepare for the worst.
But for some reason people keep thinking
I guess this post of yours makes us soul mates....
I believe the smartest plan is to go forward expecting zero from Perk for the upcoming season.....let him come back and provide some gravy, or let him come back and pleasantly surprise and return to usual form....and if that unlikely scenario comes to pass, stop crying because some ancient, broken down, dinasaur of a center has to ride the pine a few more minutes than he'd like.....But even in the best case scenario regarding Perk, the likelihood of all other bigs being healthy all throughout the playoffs is low imo, meaning there won't be any bigs crying over minutes next post season. At the level of intensity required, why would Sheed's back be any better next year than last?
So, I just cannot fathom, with KG's knee, Jermaine's injury history, age, etc... all the logjam talk...it baffles me to no end....
ps: Everyone was thrilled with Sheed's playoff level of play and forgave him for his reg. season performance. Now we're back to trashing him simply because people are wishing he'd morph into a dynamite wing. Let's separate the issue. Our present need for a wing should not lead people into diminishing Sheeds post-season value. I'd be happy to see a repeat performance.....what the heck is wrong with a PJ Brown-like, or even better, impact? So be happy if we get an awesome wing for Sheed, but don't bash if he decides to come back and provide excellent depth at the 5.
Finally, when we need extra bodies to give fouls in the playoffs, and protect our valued bigs from foul trouble, do you want those fouls given and by a Sheldon Williams type? Or someone else who can hurt the overall cause with mistakes, even in scant minutes? I'd rather have a legitimate player come in and do that job......