Maybe it's enough that they give a shit, work hard and the people that they manage work hard. The starters had career years this year. He somehow made Alan Anderson look good, when no one gave two shits about Alan Anderson. Even Bargs improved defensively under Casey, until he got injured and basically made himself irrelevant.
The glass-half full view is he got the most out of his personnel, the glass-half empty view is that he stayed out of the players' way.