Well for right now Kevin is about as good as these stats say. He is offensively playing like a Top 10-15 player. No he doesn't have the attributes of a dominant #1, and he is not dominating the ball -- but when your True Shooting Percentage is 70% is doesn't really matter.
In all likelihood his scoring efficiency will drop, but he will still remain very productive, whether he takes the bulk of the shots for this team or not.