The Martin hire got me looking around, and I was shocked at how few coaches at BCS schools hadn't been head coaches before taking their current job. The ones of the top of my head I could come up with are Jay John at Oregon St., Sean Sutton, Tom Izzo, Tony Bennett at Washington State (lord, how could forget to use him in Martin's defense), and Fred Hill at Rutgers. (There may be more, not sure).
This year, there were 9 BCS coaching changes, and Martin was the only hire w/o D1 head coaching experience.
When you compare that to BCS football, there's more than in the Big XII alone - Mike Leach, Ron Prince, Gene Chizik, Bob Stoops, Mike Gundy, and Mark Mangino.
What makes an offensive coordinator more prepared to be a head coach than a lead assistant?