Yeah. I'm still puzzled by Drevno. The growing narrative is that he was severely unenjoyable for even the coaches to be around, sensitive about his place in the hierarchy ... and also a bad coach insofar as the kids weren't getting it and he kept moving on anyway.
Whether that is close to true or wishful scape goating will be partially answered this season. If it ends up true: what the heck happened? He was great at Stanford, San Fran, and USC. And I don't think the likely answer is that Michigan linemen weren't smart enough to play for him. Either he never changed and Michigan is still in trouble or he did change and the story is secret and probably interesting.