Why do I never hear the names Prince, Mangino, Leach, Levitt, Gary Barnett, Fank Solich for any of these jobs? Really what happened to Barnett?

I found out for those also wondering...
He operates the Gary Barnett Foundation which was formed in February 2005. The foundation is a tax-exempt, non-profit organization dedicated to the support of educational programs for economically disadvantaged and at-risk youth. There were rumors that Missouri was thinking of hiring Barnett during the 2005 season. Source He began working as a TV commentator for the BCS show on Fox Sports Net in 2006, and continues to do so to this day. Barnett also is a commentator for Sports USA.