I don't see where this trade makes any sense for the Celtics.
Noah doesn't have much more value than David Lee at this point. He can rebound and pass but his offensive skills have declined to the point his a liability on the court.
.525
.508
.481
.475
.445
.382
That's his shooting percentage over the last 6 years. Anyone notice a trend forming? He's going to be a FA so there's no long-term in acquiring him and it's not like he's going to put the Cs over the top or anything.
Taj Gibson is Brandon Bass. Another adequate but not even good PF. Again, there's no gain with him on the court over, say, Amir. And again, he's an expiring contract so there's no long term benefit.
As for what the Cs give up, Lee isn't worth a darn (AHEM, I TOLD YOU!!!). But they're giving up their MVP from last year in Evan Turner. I'd love the Cs to be in a position to not play Turner, but he keeps earning minutes playing multiple roles for the team and generally does pretty well. They also give up the guy with the most potential in Sully who happens to be the only one in this deal that is under control after this year (RFAs don't move teams much).
And what does this solve? The Cs lose what little depth they have at SF while the logjam at PF remains. So this then requires another deal...shuffling the deck chairs isn't very helpful. I think we could do better. The only possible way I'd make this deal is if the Bulls threw in a 1st rounder in the upcoming draft (we'd throw in a 2nd rounder).