I think that's close, but I wouldn't mind give them one of Rozier, Hunter, or any two 2nd rounders.
I do agree we shouldn't trade AB for Ibaka, until we have someone to replace AB, at the moment AB is our best two way player.
Mind you OKC is VERY VERY good at drafting, they drafted 4 out of the 5 starts, two of them super stars, plus Harden, Reggie Jackson, Eric Bledsoe in the past 7-8 years or so. So they may value draft picks a bit more than other team would.
I wonder how they would react to an Olynyk + #16 + #23 offer.
The Thunder still need a big man who is an above average passer and can bring more overall offense to the table than the Adams / Ibaka pairing can. Olynyk can provide a lot of those things. Plus two firsts to add some cheap young talent to the roster. Help their cap situation and young talent situation.
Would Boston need to include a 3rd first round pick? A future first?
Edit: Or maybe go the other way. Olynyk + #16 for S.Adams. OKC moves Ibaka to center and now has two jump-shooting bigs to space the floor for Durant + Westbrook plus superior big man passing. Boston gets a young center who is a tough defender and rebounder.