A job of the coach is to lead and prepare. I don't care how much preparation you do, there's no way you can blame it solely on the coaches for the lack of a defense in the 4th quarter. Our DBs can't stop anybody. Surely, our offense could score more in the redzone but the O has consistently put this team in a position to win. The Steelers defense let Brad Gradkowski tear them up for 3 TDs in 15 minutes. Brad Gradkowski and Louis Murphey. OUCH. How exactly is that the coaches fault? Were they in the wrong coverage? Not likely. There's no pressure at the line nor did our DBs cover a rookie WR. The job of a player is execution.
Does Tomlin, Arians, LeBeau share part of the blame? Sure. I think they slacked this year in preparation and it's finally came to bite them. But to blame it
solely on them as beans mentioned is giving the players a free pass and voids them of personal accountability.
As for the comparison of Cowher / Tomlin ... It took Cowher 14 yrs to win a SB. We lost several close championship games under him which IMO, built the frustration among the media / fans. Plus, we all know Cowher wasn't the poster child with the media.
Tomlin on the other hand, won a SB in his second year. I'm not saying that it's right that he gets less heat, that's just my opinion.