Maryville would not run the table in 7aaa. They would still have great runs in the playoffs, and some state titles, but not at the pace they have had the past 15 years.
There is a reason 7aaa was ranked the 6th toughest distict in the NATION(I think that is what I read a little while back, cant remember source).
Survive 7aaa undefeated and win a state championship and you have a case for a top national ranking, even after one season.
Maryville's ranking comes from multiple years of winning, not from a punishing single season with a state championship at the end.