Brown does give me the impression that he is a cranky old bastard. See my Ditka comments. He is funny. No nonsense. No wonder he and Harbaugh get along well. Brown isn't running for political office.
Now to your point which I think is very astute and you should be given some kudos for acknowledging this variable...Brown is inheriting a stacked defense the same way Jim H. got back in the day.
Not saying Brown isn't a better DC but Brown must realize he has essentially this year to create a dominant once in a generation type of UM defense. Most of these guys will be gone next year. Not saying UM can't have good defenses but if you look at this defense now...that is some serious talent...I mean NFL draft talent. This defense can give UM a chance to win any game. Any game including against a team like Clemson.
You have a dominant DL then any opposing offense is swimming up stream. Not only that...they have depth on line coming out of their ears.
RM