He calls his timeouts too late on the opposing teams runs. It seems like every game that we lose, the other team starts off the 3rd quarter on a huge run, where there was an obvious shift of momentum where Mark should have called a timeout, but instead, he waited about a minute too long which really costs us.
That really is my only complaint about Diagz though. He has been so good at everything else and is the perfect coach for this team
You either temper the team now or watch it shatter under stress when it matters.