My guess is that coaching at NAIA level is a "whole different kettle of fish" than coaching in D1 BCS. I bet he doesn't have to recruit as hard, or as long, and he doesn't feel as much pressure to excel.
This is the dumbest thing I've ever heard. People that aren't internally driven don't become coaches at ANY level. You think he's coaching at an NAIA school for the salary or the prestige? Either he still loves the game too much to leave, or he feels like he has something to prove - probably both.