Just at a glance, the aforementioned player pairing problems—
multicollinearity issues, to be specific—do seem to affect the ratings. Take Nick Collison as an example. He's
sixth overall in RPM, which could lead you to believe that he is a secret cog in the Thunder machine. And yes, Nick Collison is great for what he is, but sliding in ahead of Steph Curry and Tim Duncan does raise a few questions. Just hazarding a guess, could Perk and his literally-worst-in-the-NBA -6.19 Offensive RPM (-3.19 overall) have anything to do with that? This type of analysis expressly tries to isolate a player from his context, but in extreme cases like this, things can get messy. One surmises that Collison often replacing the single most disastrous offensive player in the known cosmos has some kind of effect of his rating, which is the sort of thing that would show up the limitations of this sort of analysis. Then again, J Crossover is currently backing up Willie Green.