The celtics biggest need is probably center if kg moves back to pf which has been well documented he would prefer to play there.
Chris is a legit 7 footer who is active on both ends, not a terrible athlete at all for his size, can score in the low post with either hand and has some nice moves, can hit that mid range jumper that rondo gives to every big, and he would allow bass to move back to the bench where he is much more effective.
While I agree this move will not make me do cartwheels we can do a lot worse. I would think at this point in his career he would take a pay cut to join a contender because nobody is paying him what he made on his last contract.