Tonight's the night for KG to carry the team. Pierce will play, maybe he'll be effective, may be won't, but KG should be THE MAN.
We know the Lakers have no one to stop him.
Put KG in the post with four 3 point shooters around him - House, Ray, Posey, and Pierce (who should be able to stick the 3 even if his knee isn't great) or Sam
A variation to this is with a big on the weak side for rebounds (PJ or Powe). This is the the old Rockets offense when they won it with Hakeem. Combine that with the Celtics D, and that alone should net the Celtics a win tonight.
Go Celtics!