Actually I am not. I witness a bad BE team come up to Waubonsie and send them home. That same WV team that you suggest would have won where BB couldn't. You are using theory versus looking at the matchups. It's not about class as much as it is about matchups.
The close game with BB came from them putting their QB 10 yards behind the line of scrimmage to negate the pressure giving them more time to throw which force the DB to cover longer than 3 seconds. It was a great game plan that they executed perfectly. If Rochester, a 4A school, came up with the same game plan that day, the results could have been different. I respect coaching and game planning regardless of class. Often time in the same class, a team can have different results in the playoff bracket based on matchups.
The same Glenbard North who made noise in 8A lost in 7A. Does that make 7A better? The same MC that struggled in 8A until they finally broke through struggles in 7A as well.