I'll let one of the people who have it answer that question, 'Horn.
As far as the list, I guess it depends on what the criteria is. If it is outright football success and nothing more, I guess I would go with Bryant, Bowden (though I still can't frigging believe he gets credit for his wins at Howard or wherever the frig it is), Rockne, and any of Leahy, Fielding Yost, Wilkinson, or Royal. If it is the greatness of coaching, molding young men, academic record, charity, the works, where would I want to send my son, it would be:
Paterno, Hayes, Rockne, Yost.