I think it might be best for the team as a whole if Jeff Green has a very good end of year and playoffs and then the Celtics use Green's increased value(and maybe another player if necessary) to get a sign and traded player like Tiago Splitter or Paul Misap or Josh Smith or Nikola Pekovic or maybe a traded player like Pau Gasol or Emeka Okafor, you know, a big that can give you close to a double double, play good defense, and possibly be, if Gasol or Okafor, on a short contract.
I would gladly give up Green's possible future for a big that can be thrown into a frontcourt rotation and give the team the 10/10/1 they desperately need from the front in a one last ditch shot at a title before KG and Pierce retire. And, if you get a player like Okafor, then his salary comes off the books the same time as Pierce's and KG's and make it possible for a 2014 max free agent to be signed like Carmelo Anthony, Lebron James, Chris Bosh, Dwayne Wade, Greg Monroe, Paul George or DeMarcus Cousins(though every player on this list would be ETO's or RFA's).