Considering that Boston is in "win now" mode at this point, I can't see trading assets for a player like Bamba, who still needs time to develop. We got Williams in the draft. We have at least 3 picks in this year's draft and possibly 2 in next year's draft. That's where you take young centers to develop.
If Boston is going to trade for another big I'd rather see them acquire someone who has already shown that they're physically capable of being a rotation player. I'd love to see them get Hermangomez from Charlotte if possible, or someone else along those lines. Some package involving Ojeleye or Yabu with a pick might make that happen. Ojeleye needs to go somewhere that has minutes for him.