he is but he's getting help from brooks.
all tony allen has to do is pick up durant in transition
and if he doesn't all he has to do is keep him fro the elbow of the free throw line on either side.
he doesn't have to play pick and roll
no backdoor
no post up
nothing
just the elbow. shit there are a LOT of defenders who would love to have a defensive assignment like that.
At the same time everything you just named does not suit KDs game he's an ISO player. All that you are naming doesn't suit their personnel.
No it's not KD's game but at this point what OKC is doing with him is not working. A pick & roll or back door screen is so simple but let so effective. All that iso bull shit ain't working when you're rely on jumpers. OKC has to attack & wear them down.