Dort may not be a foundation piece for the team, but he is the best value. If that contract is going to go to high then I guess long term unlikely to keep him so may as well get some value out of him.
Maybe it would take the 12th pick, instead which might not be worth the difference on who they can get that suits the team (given that most of what is between 4th and 12 is going to be positions they need less unless something like Sochan falls elsewhere and if that is OKC's target.
Love Dort, don't want him gone, but if they can get that rebuild going sooner with a team that could use the muscle to shoot now for sure do it.
Would the Kings take it? Probably not. OKC doesn't have players for the now worth enough to lose the 4th pick outside the two they wouldn't want to lose (SGA and Giddey).