Well, literally every stat in existence would disagree. The game winners were just about the only thing that went right for him last year.
And I know some of you won't believe this after my Pascal takes in the other thread, but Fox should win this pretty easily. He went from a bottom 10 player in the NBA last season, to a fringe all-star talent this year. That sort of jump is extremely rare and something we don't see very often in the NBA. More often than not, rookies who have atrocious rookie seasons end up as Josh Jackson or Frank Ntilkina; guys with some potential, but are so, so, so far away from being real NBA players
It's dumb the award makers attach certain qualifiers for certain awards. Just because Fox is a 2nd year player, doesn't mean he's not the most improved.