I think that Pierce should to play as SG, Bradley to the bench and JG as SF, this is the best possible for the Celtics right now. I dude that the Celtics can to sign a guard better than Pierce, Pierce at 35 is better than 80% of the sg in the league.
One more run, Lee, Bass traded, Kg as PF, and sign a big man, Big Al is the best option via trade, altought Celtics have little money.