Last year has nothing to do with this year, and the dismantling of Rochester by SHG doesn't build confidence.
I've seen this mentioned by a few posters, but let's look at the results from the last two years:
Last year, SHG put a running clock on Rochester, with the final score 56-13.
This year, SHG beat Rochester, with the final score 53-34.
If Rochester getting clocked last year didn't diminish confidence, why does it this year? Rochester put up a better fight (their offensive is a lot better, the best I've seen it since they joined the CS8) and SHG's defense is pretty good (similar, maybe slightly better against the run), but their secondary isn't quite as deep and talented as their receiving corp in a near mirror match (this is historically an issue with SHG that SHG solves with big plays when it counts and a bend but don't break mentality). One thing I'm sure of is that Rochester will not encounter another defensive line as large, physical, and disciplined in their march for their sixth consecutive title. They also will not face another offense that can put up 700+ yards offense on a bad day.
I'd echo the other posters in that it's difficult to compare what SHG has done in the south to Chicagoland, except to state that they've looked very similar to past SHG teams and seem headed for a rematch against Montini. I'm probably a homer, but from watching other games online, I don't see that many 7A and 8A schools that definitively beat SHG every time.