If KG retires after next season, the Celtics could theoretically have the cap space to sign a max free agent or make it easy to trade for a big contract in the summer of 2014.
Would you overpay potential restricted free agent Larry Sanders and hope the Bucks don't match? Would someone like Pau Gasol still be able to play at a level worth a $10-12m contract? Will the Celtics have the assets to bid for Lamarcus Aldridge if he looks likely to leave Portland and the Blazers try to get something in return with a year left on his contract? If Derrick Rose proves to be a mentally shattered shadow of his former self, will the Bulls look to blow up their roster and trade off Joakim Noah?
I can see how the Celtics would have a shot at adding an All-Star caliber big to a core that could include Rondo, Green, Bradley, and Sullinger.
It may require moving some contracts, but at that point, Terry and Bsss are expiring contracts who could be included in a trade.