I've seen three of the four teams play (haven't seen hartington). Just saw Battle Creek this last week and I've got a dynamite scouting report on them...they're bigger than everyone else. Not just sort of bigger, they're a lot bigger across the board. They are just manlier than the other teams. They aren't a fancy football team. They're just bigger, stronger, and generally faster. You can't teach big.
Now that being said, if anyone is going to knock them off, I would have the most faith in Aquinas considering Mimick's track record. He's had pretty much the same exact offense since he started. Aquinas is never the biggest team. They consistently play with some of the smallest offensive linemen you will find. Their offense works because they're great at misdirection and their linemen getting angles/leverage on defensive linemen.
From experience, the best way to beat Aquinas' offense is to get great penetration to disrupt the backfield, which I would predict BC to do.