I don't really see why Durant should post anyone up. He is tall, but not strong or heavy. He should face-up so that he can shoot over smaller players and blow by bigger players (and he does).
If there were any area of his game that I'd like to see improve, it would be his defense first followed by his ability to create for other players. Then again, on that particular team, I don't believe that they need to rely on him for either of those things so it is not a clear detriment, either.