I don't like this trade for anybody.
Ibaka is more of a 4 than a 5 and the Celtics need a center next to KO. Plus, I'd prefer Sully as the 4 over KO. And I don't feel too good with Turner as the starting 3.
The Thunder have a good thing going with Ibaka and Adams as their front court. They just need to tread water until Durant and Westbrook return.
Indiana will then need a center and Green will be regulated to the bench when George comes back.
Any move the Celtics make will need to be in light of future seasons, not to contend this year. They just have too many young guys to expect them to go far this season.