1 )Dude, Cowher was winning division titles with O'Donnell ( and going to the super bowl ).
After Neil left he had to start, Stewart, Tomczak, Miller and Maddox, yet still went to the playoffs with them under center. That takes good coaching. Tomlin would have been fired with any of those jokers after 4 years.
2 ) Tomlin inherited Lebeau, and fired Arians, who was the last OC to take the Steelers to the super bowl. Yes, a head coach is responsible for hiring the OC and DC. So how did Haley work out? I'm saying the best head coaches take a part of their game and enhance it with their new team. Tomlin never did this.
3 ) Do you ever see Ben and Tomlin talking on the sideline? Nope, he knows too little about offense. As for the defense, I hardly see him talking to the captains there either.