Brown has a reputation of being pretty aggressive actually. Here's a nice write-up:
http://www.elevenwarriors.com/ohio-...-new-michigan-defensive-coordinator-don-brown
From that article, here are Don Brown's Defenses:
View attachment 1832
I don't think BC's new play-caller, Reid, is as aggressive even though he's apparently running Brown's scheme. Still, I think what jumps out from that table is that he's not getting that improvement on D simply from new talent.
Last year's BC offense scored 0.61 ppd vs pwr5 opponents on average and allowed 1.19. By this stat, they were the worst offense that played more than 2 pwr 5 opponents and the best defense. That says something about those who want to blame poor field position from the offense for bad defense and vice versa.
Last year's GT offense scored 1.73 ppd vs pwr5 opp and allowed 2.47 (#55 and #54 of the 78 teams that played more than 2 pwr5 opp's).
In Saturday's game, BC scored 1.4 ppd (more than twice as efficient as their average last year) and allowed 1.89 ppd, which is more than they allowed anybody but Clemson last year. So, I think it's safe to say that our offense will be better than last year. When we score more efficiently than last year's average against a D that returned 8 starters from the best D in FBS last year, that should be a good sign that we're better. However, it's harder to tell whether we'll be better on D because we have no way of telling yet how much better BC's O will be from last year.