Of course a coach is supposed to get his team ready to play every game like it's the national championship. Very, very few coaches manage to pull that off. What I'm looking at is whether there is a schematic issue or a personnel issue (or both). If I see a game where Miami shuts down a top offense but then the next game gets gashed by a lesser ranked offense, I can deduce that the players are inherently capable of playing good defense (since they demonstrated that before) but there was a schematic breakdown and/or a motivation issue. Of course, you have to take into consideration the same for the opponent. Maybe they were having an off game and it was more their lack of execution than what Miami did. I think VT was playing at a high level but Miami just played a better game.
I agree with warning signs. That being said, Diaz clearly saw the signs as well and hired T-Will to help fix the LB issues. People seem to forget that or think it was just idle speculation. Diaz offered him the job and he accepted. Unfortunately he took a DC job after getting the Miami LB coach job. Good for him, bad luck for Diaz (and us).
So then Diaz went and got one of TAMUs best recruiters as his plan B. Unfortunately the guy didn't land Tolan, but im not going write Aristide off and say he was a bust hire based on a 4 month snapshot. He may be key in landing a couple other top tier LBs. We'll see.
We also know that Diaz was very unhappy with how Baker was calling the defense. I think the best defense Diaz had was 2018. The most a team scored during the regular season was 33 points (LSU) . Only one team in the entire regular season scored more than 27! If you'd paired that defense with Lashlees offense that is 100% a playoff caliber team. Think about it- all the offense had to do was score 28 PPG (which is basically nothing nowadays- would be the 64th ranked offense) and Miami is 11-1. I'm glad that Diaz brought in Shoop, I think he's going to be a big help in making the defense be more consistent.