So you agree that with an elite coach (Riley), this exact same roster is EASILY a 10 win team and should destroy UNC. This is why I think the game is critical for Diaz's reputation and either validates or invalidates Miami's hire. Losing to a team with a similar talent level like UF is forgivable. Happens to even the elite coaches. Losing to a much less talented team can't be excused with this roster (as you indicated, Riley would have no problem winning bigly with the same players). Is Diaz on Riley's level? No, but Riley wasn't on Riley's level at Oklahoma when he was promoted from OC to HC.
Riley was a highly regarded assistant with no HC experience, but everyone would agree that Oklahoma found a gem. Yes, Oklahoma was a 10 win team when Riley took over, but Miami was just one season removed from a 10 win season. Diaz did not inherit a roster devoid of talent. If the excuse for losing to a team like UNC is that Diaz is new to being a HC and that fans should have a more reasonable expectation than a 10 win season and ACC coastal crown, it's an early indication that Miami made a lazy hire. If Diaz needs training wheels, he should have stayed at Temple.
Richt laid a decent foundation for an innovative coach to win immediately (I said Richt was the Buck Showalter of college football when hired). Miami now has a QB, RBs, TEs, WRs, and an all around elite defense. 3 out of the 5 linemen are also good to very good. There are two question marks on the OL, but if the team can't dominate UNC despite having superior talent at every other position, something is seriously wrong. I have no reason to doubt Manny (yet). Miami wins by 17.