Strip away the NIL stuff.  Other than being a good defensive coordinator, what has Brent done that could even possibly make you think he would be a VERY successful head coach?  Dude is one of the worst strategists I have ever seen.  Wastes timeouts.  Poor clock management.  Indecisive when it comes to making key decisions.  A history of not playing the best players at certain positions (or making sure his position coaches do).  Inability to get the team to play with any discipline (see: turnovers and critical penalties).  Add in some bad hiring decisions and the mishandling of the QB position, and he has pretty much been bad across the board.