In answer to the original question of who's running the HUNH spread, it's anybody who doesn't think they can match up man for man against more than half of their schedule. It gives the best chance of an upset in a single game....it doesn't give anywhere near the best chance of a championship season.
Plus, it's even more QB-centric than most offenses. We in the Deep South tend to overrate its overall effectiveness because we've seen Tim Tebow, Cam Newton, and Johnny Manziel up close. The fallacy there is that each was a Heisman winner, and each team rode that one horse to whatever success they had that year.
If you want to build your program around winning a championship every time one of your quarterbacks wins the Heisman, be my guest. Meanwhile, in the other 49 of 50 years, old-man football will kick your hindquarters the significant majority of the time.