I was referring to a particular game that Cousins played in while he was still with the Kings. It was one of many, and not just Cousins, but other Kings players who had good games, but got a minus rating. And, I agree with you that those ratings are swayed by who your on the floor with. I wasn't implying that those ratings were running rampart, but they are referred to from time to time and they don't carry much weight with me.
Hey, I go check the defensive ratings of players all the time, but I usually do a historical look as well, like I did with Temple and Koufos. It can help put things into a little different perspective. For instance, if by looking at Temple and Koufos, and realizing that their defensive rating is being inflated by who their playing with, then maybe I can apply that same logic to other King players.