That clip showed a little bit too much arrogance and smugness.
He does NOT have the answers and the second he thinks he does, he's a hard headed idiot.
Managing people is damn hard and I can say that with massive 50 year experience and ridiculous about of people. It's a job that you do as best you can with experience and common sense. Lots of mistakes starting up but you learn and adjust. There is no absolute set formula but there are rules that can not be violated.
For Marty coaching, this isn't even remotely complicated or hard to see.....he's implementing a system that is not working with the players and the talent he has. If a player or two can't adjust, it's one thing, if the entire team can't adjust, then it's him and his system.
We had BargainBin who was a complete amateur in management thinking he was old style "manager", instead of actually, a failing idiot. Running the team was WAY past his abilities and IQ. Now we have a coach who thinks he's so smart and smug that he doesn't see criticism or his failings.
If he doesn't change and adapt by Xmas, we're f*****d