Not sure who else is going to have the assets to get Zach. I'm sure the Lakers may want him, but if I were the Bulls, I wouldn't want 'Lo back for him.
Unloading salary and restocking picks would be a good haul for the Bulls. Orlando slots him in directly at SG. The rest of the Magic cover for Zach's unwillingness to play defense.
Bulls can get a couple better players by trading DeMar and Caruso.