There are reasons classes are divided in all sports. It is a numbers game, and the more enrollment you have the odds are the more talent you usually have. For that reason alone I agree with Frog, a class 4 would almost always be an underdog to a class 6. I think most of us sane people agreed with that all along. Webb beating Rock in KC last year planted a seed of doubt to that theory however.
We may wake up tomorrow after beat downs to WC and Nixa and return to our thinking that bigger is better.