You're exactly right. It's not like Ensworth can't pull a Knox Catholic & decide to play in D1 for a change. CAK moved took the multiplier & move on to D1 too, but schools like Brentwood Academy & McCallie are the reasons why TSSAA split the whole system up in the 1st place.
You could go on & on about this public vs private BS. I hear it all the time with private school friends who went to schools like Father Ryan, Baylor, CBHS in Memphis, all over. Comparitively speaking, the only school with a lengthy tradition like a Maryville & or Alcoa would be Brentwood Academy. Baylor's rarely won it, Ensworth hasn't been around long enough to be considered, & MBA's run seemed to fizzle out now that Ensworth's the big dog in D2. Regardless, even though the claim can be made that Brentwood Academy has been to more championship games than everyone, they've lost more than everyone too & still haven't won as many as Maryville or Alcoa.
The records they currently have against each other (Maryville vs Private Schools & Alcoa vs Private Schools) is in Maryville & Alcoa's favor. I think it would come out that way now given they played every year. With all of that being said, there's still no way Bowers is as good a coach as Quarles. Bowers will always have the easier path to a state title & still won't win near as many as GQ will win when all is said & done.