I don't have access to prior seasons for Allen, but here is the recent history in Tark so we can see if there are any trends.
Elite Eight teams in Tark D1 (champ-runner up-FF-FF-E8-E8-E8-E8)
Season 128: Denver, Syracuse, Michigan St, Utah, North Carolina, Kentucky, St. John's, Baylor
Season 127: Denver, UConn, LSU, Eastern Illinois, Georgia Tech, Utah, Kentucky, Duke
Season 126: Utah, Iowa, Stanford, Georgia Tech, Maryland, Florida State, North Carolina, UCLA
Season 125: Georgia Tech, Duke, Baylor, Maryland, UTEP, Utah, Syracuse, Ohio State
Season 124: Maryland, Villanova, Duke, Michigan St, UConn, Kentucky, Sam Houston, Michigan
Elite Eight teams in Tark D2 (champ-runner up-FF-FF-E8-E8-E8-E8)
Season 128: CSU-Bakersfield, East Strousberg (PA), Tarleton St (TX), Chadron St (NE), W. Alabama, Seattle, San Fran St, CSU-San Bern
Season 127: U of the Sciences (PA), CSU-Bakersfield, San Fran St, Quincy (IL), Indianapolis, Mercyhurst (PA), CSU-San Bern, Chadron St (NE)
Season 126: Tampa, Indianapolis, San Fran St, Clayton St (GA), Tarleton St (TX), St Rose (NY), S. Illinois-Edwardsville, West Georgia
Season 125: Montana St-Billings, San Fran St, St. Mary's (TX), Quincy (IL), N. Kentucky, Shaw (NC), S. Illinois-Edwardsville, Millersville (PA)
Season 124: Millersville (PA), E. New Mexico, St. Cloud St (MN), W. Chester (PA), S. Illinois-Edwardsville, U of Sciences (PA), Indianapolis, Chadron St (NE)
Elite Eight teams in Tark D3 (champ-runner up-FF-FF-E8-E8-E8-E8)
Season 128: Greensboro (NC), Stevens Tech (NJ), Brandeis (NY), Dallas (TX), Menlo (CA), Colorado, Millsaps (MS), Lynchburg (VA)
Season 127: Curry (MA), PBAU (FL), SUNY-Geneseo, Greensboro (NC), Lynchburg (VA), Baldwin-Wallace (OH), Methodist (NC), LaGrange (GA)
Season 126: PBAU (FL), SUNY-Geneseo, Suffolk (MA), Occidental (CA), Stillman (AL), Keuka (NY), Lynchburg (VA), LaGrange (GA)
Season 125: Brandeis (NY), LaGrange (GA), E. Texas Baptist, Pacific Lutheran (CA), Farleigh Dickinson (NJ), Lynchburg (VA), Colorado, SUNY-Gen
Season 124: Montclair (NJ), Lynchburg (VA), Texas-Tyler, Greensboro (NC), Dickinson (PA), Dallas (TX), Farleigh Dickinson (NJ), Stillman (AL)
Looking at this, I think it is inaccurate to say that playing out west or in Florida gives you a huge advantage. The fact that there were a lot of champs from the West seems like a fluke this year. And with the exception of Utah & Denver, D1 looks pretty normal. A lot of blue blood programs with an occasional midmajor.
BUT, I do notice a D2/D3 pattern. Because D2/D3 are relatively sparsely populated with humans, success at that level is all about grabbing D1 dropdowns in the second cycle. Because of the limited scouting/recruiting budgets at lower levels, you need to be in a geographic area that is going to produce a lot of D1 recruits. California, New York, Pennsylvania, Massachusetts, Illinois are all over-represented at D2/D3. There isn't a "West plus Florida" bias; there is a "Be in a state that generates a lot of D1 recruits" bias.