It's funny how winning one Super Bowl changes peoples opinions of you. Cowher was a loser for 15 years before Super Bowl XL. Nobody wanted him, many in Pittsburgh wanted a change. He was Jeff Fisher and Andy Reid rolled into one. The guy who couldn't get the job done the guy who can't get over the hump. He did, and now he's the greatest thing since sliced bread? I'm not buying it. Over rated.
So is Gruden, so is Shannahan.
The best way to find a coach nowadays is to get a successful coordinator like Sparano, Harbaugh or Mike Smith. Yeah they haven't won Super Bowls, but they haven't continually failed either. Nothing on the coaching market impresses me, let them get Gruden or Shanny these guys have done nothing significant in many years, and in Buffalo it will remain that way.