Denver has Manning, they are a pass first team. Patriots have a legendary QB and legendary coach, pass first team. Steelers had Le'veon Bell, rushed for 1,300 yards and had an additional 800 yards in receiving. Indy and Detroit specialize in the passing attack. Different offensive philosophies.
You are then comparing more complete teams to teams like Philly (Who made the playoffs the year before with a good rushing attack), Kansas City (Made the playoffs the year before with a good rushing attack), Houston who made the playoffs in 2011 and 2013 relying on the run, and San Francisco who made the playoffs from 2011 to 2013 because of a good rushing attack. They miss one year, and now their offensive philosophies are something we are going to overlook? Philly and Houston have no QB, and Philly was kept out of the playoffs mainly because of a certain team that specialized in rushing (Who was that!?). Kansas City Chiefs are still a solid team playing in a very tough division.
Sorry, but I'm not seeing your argument here.