How do we know he's a great coach? He could be a really good position coach, but that's about it.
I heard this on the radio after the game, and it is something I said shortly after Mickey was named Interim Head Coach. If you don't want to count this year's games against him, then let's throw this season out completely and go back to last year. If Trev would have fired Frost last year, would Mickey have been a serious candidate to be hired for the head coaching job? If that answer is no, then there should be a lot of other candidates ahead of him on the pecking order.
Just because MJ wouldn't have got the opportunity if Frost was fired last season to be HC, doesn't mean he wouldn't be a good HC.
Frost, Riley, Callahan all had HC cred but weren't nearly as successful as Bo no with HC experience. Let's not mention TO also didn't have HC creds before he got the nod.
The man is doing well with what he has, and the situation he was brought into.