And while he was a good head coach, record wise, it took him 9 years to assemble his championship team (though he was there one other time).
We've seen in the past that "retreads" don't usually succeed, and a guy who's been out of football for 5 years may not have the same edge. Certainly the game has changed, and not necessarily to his style.
On a related note, wouldn't it be sadly amusing if Cap'n Izzy Firepants decided to hire Cowher, and forgot the little detail of interviewing minority candidates? Wouldn't he look silly? Or sillier?