Lots of D2 and NAIA schools in particular rely heavily on transfers, whether JC, drop-down or other. Certainly not all but plenty. I have always found it interesting... it seems to be either prevalent or non-existent in pockets, geographically and among conferences. Of course, the academic and religious slant are big factors. The Tampa guy appears to fully maximize the transfer pipeline, along with also taking advantage of an IMG connection (and, undoubtedly, location). Looks like he has quite the system.
Most of the more competitive schools in son's conference, located mostly in the Ohio River Basin, rely heavily on JC transfers, many from California or Florida.
Interestingly, and also not surprising, this year's NAIA Champ Tennessee Wesleyan has much the same model... most contributing players are transfers across JC and multiple other levels. This, too, is a program that is a perrenial winner, taking the conference crown ten of the last eleven years. The coach there has earned multiple conference, regional and NAIA Coach of the Year awards.