Don't fool yourself. The D is absolutely Diaco's fault. No fire in any of the players and the scheme is absolute garbage. Both of those fall strongly on the DC... the 2nd more than the first, but they both are coach-able. The fact he is not doing it is absolutely 100% his fault. Not sure why people want to give him a pass. He's not that good, he's never been that good, and here he is a just godawful. Maybe he can tell his alien friends about it and get them to commiserate.