I have actually seen a similar classification system in print. I think it may have been the beat writer for UA_Monticello, maybe 10 years ago.
BCS/AQ/P5 = major
Non-AQ/G5 = mid-major
FCS/D1AA = low major
D2 = mid-minor
D3 & NAIA = minor
I'm not saying I subscribe to that hierarchy, but many sportswriters seem to.