It's hard to imagine that the 12 playoff coaches have anything to prove, but they do.
As usual, the playoff list of coaches is impressive. There are Super Bowl winners -- Mike Shanahan in Denver, Mike Holmgren in Seattle, Bill Belichick in New England. You have others who have been to Super Bowls -- Bill Cowher in Pittsburgh and Mike Martz in St. Louis. And there are the perennial playoff coaches -- Andy Reid in Philadelphia and Tony Dungy in Indianapolis.