Obviously without knowing the formula and what is accounted for and how, it makes it more difficult to offer critique, however, looking at the rankings they appear to about what you would expect if you were putting something like this together. Harden and Giannis at 1 and 2 and a good deal better than the next group, who have Embiid, George, Curry, Davis, and Durant all pretty closely grouped, followed by Lebron, Westbrook, and Kawhi. I mean looking at the stats for the season, that seems about right. I'd definitely be interested to see how much games played alters things.