You are making a ton of assumptions here. Being the OC or DC are not the same as being the HC. All coaches know the basics of the game on both sides of the ball but becoming a coordinator takes that to an entirely different level. Throw in QB play and playing calling and I can tell you, it is nothing like anything you have ever done. I called JV plays at a small school, one of the most stressful things I have ever done, even at that low level.mickey was a qb, and wr coach...and other stuff for along time...if he were to jump up at NU, Im 100% more confident in him jumping up from wr coach to oc (under rhule's guidance) then jumping from wr to hc...which has been suggested multiple times by scores of peoples.
plus it's just logical to go from wr coach to oc, then wr coach to head coach..
and I'm pretty logic based...3 actions are done at 1 time..
1. retaining mickey by advancement
2. keeping mickeys recruiting skills
3. not having trev roll the dice
big picture, past, present, future, allways
I personally would be comfortable with Mickey as the HC who brings it all together with good assistants to run their side of the ball. Hire specialists who are very good at what they do.