I'm just going to say that I still don't think they've come up with a good way of measuring defense.
For instance, we see that Derrick Rose has one of the best Opponent PERs in the league, but he's rated pretty low on this scale. Meanwhile, guys like Mike Miller and Rudy Fernandez rank among the very best defensive SGs in the league. I don't buy it.
Similarly, Elton Brand and DeJuan Blair rank as elite defenders; I've watched a lot of both of them, and that just doesn't seem to jibe with my observations. Similarly, is DeAndre Jordan really the third best defensive center, with Dwight Howard sixth?