while this is the boring part of trade discussions (for most, understandably -- i happen to enjoy it), Gasol's salary doesn't match up well with the Cs.
If you trade Lee there (say, plus a pick), the Bulls would have to add in 1-2 more players to make the numbers work. And then so too would the Celtics, who I don't believe would offer ANY rotation player or young player into such a deal.
I mean, would Ainge do Lee + Young for Gasol + (dead weight / injured / expiring) Noah? Would the Bulls? The teams hardly look like strong trade partners...