I may be wrong here in my understanding of the stat, and correct me if I am. Point I'm trying to make is that Kosta/WCS (who IMO shouldn't even be counted) play more with Collison, Marco etc. So the team defense when Cousins is out goes down but it's not only because of him, but other better perimeter defenders going out as well.
As far as getting back goes, not doing so fortunately doesn't always lead to the opponent scoring if the rest of the team plays good D or the opponents just don't capitalise. Doesn't mean it's good defense but as a result it doesn't get picked up in statistics, but it does when you watch the games.
