Kawhi should win it.
Westbrook has been impressive, but he wont win more than 47 games, which should take him out of the running. Statistically he's not all that much better than guys like Lebron, Kawhi, CP3, Curry, Durant, Harden.
Lebron actually has an ok case statistically, but if we are discounting all the Warriors because of the super-team argument, i dont think Lebron gets a pass either. Also, the Cavs might not even come out on top in the East.
Harden does have a case as the most productive player on one of the top 3 teams, but the Spurs are a lot better than the Rockets and Kawhi puts in so much work on the defensive end on top of his offensive production. If you cant make a solid statistical case that Harden is better than Kawhi, and the roster around them are similar in quality, i think the award has to go to the guy with the most Ws.