I think yes because I think Sully is starting to get in shape and starting to become a force. I have seen him be the best PF on the court for the last 2 weeks and I think he's only getting better. He will be a 20/10 guy be the end of this year IMO.
Rondo and Sully right now are the building blocks. Rondo is our all around do it all player, Sully our inside banger. The question is who/what complements them?
If you get a big that clogs the middle it will effect Sully's game, if you get a ball controlling wing player it takes away from Rondo.
Also this "WE HAVE TO HAVE A RIM CONTROLLING BIG" stuff is a bunch of crap! Every team is different, and what we need is a team that complements each other. Detroit has that big and they suck, I watched Jordan wing 6 championships without one, the Queen has won 2 (didn't watch those cause I hate her). Yes I realize they are/were the best players, but they had talent that works well together.
*On a side note I'd take Melo.