See "In General", always exceptions:
D1-AA top tier is located away from quality D1-A programs.
Georgia Southern hasn't won in 24 years. Marshall was 1996.
JMU snuck through a few times, but Virginia isn't exactly loaded with solid D1-A Programs.
D2 top tier is located away from quality D1-AA programs. i.e. Michigan
Ferris, Valdosta, NW Missouri, Pittsburg don't have CAA type D1-AA programs pulling from them like PSAC.
D3 top tier is located away from quality D2 programs. i.e. Ohio, Illinois
Mount Union is close to PSAC West , but PSAC has never won a D2 championship and won't anytime soon.
St John's (MN) has MN State (few finals and semis) and Bemidji which have been solid as of late.
WI Whitewater is 6 hours from Ferris.
Ease of transferring nowadays will definitely shift the playing field.