Only way Ibaka becomes even remotely available now is if Durant leaves.
Oh..dear, looks like OKC is killing Warriors.
Anyway, the reason I think Ibaka can be available:
1. He's not totally happy with the new coach
2. Next year is his contract year, he'll demand big money, his current $12m is a bargain, OKC may not want to offer the money he wants because KD and Westbrook need to get paid first.
3. Because all 3 of them become FA next year, OKC could end up with none, so they may decide to trade him first and get some return without affecting their flexibility.
4. he's now less important a player than Steve Adams, OKC will still be strong if they get a quality big back
5. If OKC doesn't win this year, they need to improve, trade Ibaka may bring them pieces that make the team better
Ok, a lot depends on KD, but I don't think Ibaka is untouchable.
16+23+one of KO, Sully, Jereko, or maybe Johnson is reasonable
I'd throw in Young, Micky and any 2 second round picks,
I'd even throw in Rozier or Hunter if that makes the deal
Or maybe change 23 to next year's pick.