Just read this. The difference in rankings between all four stats (the latter two of which are
not advanced stats) really demonstrates how little we know about quantifying NBA defense.
Also, this has been written numerous times (and
@David. has made this critique of defensive metrics), but Kawhi's defensive metrics are low this season for two reasons. First, Danny Green and Dedmon are succeeding unusually well at their positions, thus the seeable impact of Leonard's defense is slightly lessened. Second, teams are putting Kawhi's man in the corner and not involving him in the offense. This is not well reflected by DRPM whatsoever.
Point being, if these rankings don't view Kawhi as a good defender, they really shouldn't be trusted. Kawhi is the best perimeter defender in the NBA right now, and the best I've seen in years. LeBron is the best team defender I've ever seen.