One other thing about WPA is it only measures offense. I can't think of specific swing plays on defense. I think he's been involved in some misplayed balls that drop between Robles/Stevenson and him. It's also tough to figure out the balls at the fringe of his range or beyond that an average guy gets to. FWIW, UZR is down on his arm, which is supposed to be the best part of his d. I don't remember which play or plays it is that led to that.
It also doesn't include a positional adjustment. It's basically, for hitters, whose at-bats are the most impactful. It's an absolute value metric, not a relative one.
