Listing the stats of Perk and JO and claiming that they're a wash on this roster is ludicrous. Perk is doing exactly what the 5-1 Thunder need him to do - much up the lane, lead the team defense, add toughness, set picks, etc. His stats are in line when Perk usually does, with a big bump in FT% early this season.
The Cs are 22nd in the league in FG% defense, while the Thunder is 7th )Last season OKC was 15th). If we're going to evaluate Perk, we have to give him his props for what he does bring to the table. Perk has helped, along with Nazr Mohammed, change the culture of that team, from soft defensively, to tough and competitive defensively.