Great post.
I think the only part you are missing, and what so many who are concerned about the program are thinking, is that Manny can't be that CEO and be the DC/HC at the same time. If he had been able to go out and hire either a proven DC or whatever the equivalent of Lashlee is on the defensive side of the ball, there would be a lot less reason for concern.
There are many who want to pretend that Manny can be a first time head coach and an elite DC at the same time. "Baker fired, Manny is DC, problem solved, team is improved" - that seems to be the logic. There are at minimum a lot of holes in that logic, including whether Manny is even an elite DC when all he is doing is being DC.
But you're right, man. Manny has some positives that he can bring to the program. The question is, especially as a first time HC, will he simply make too many mistakes and misjudgments (much like Mark Richt could have been a great CEO if he hadn't been so insistent on employing his son and running the offense).
At the end of the day, you either win the games or you don't. I really hope we win lots of games and Manny succeeds. I also really hope that if that doesn't happen, he and Blake are promptly fired and we stop repeating the same mistakes over and over again expecting different results.