Heyward was in the game yesterday. When Aaron Smith got carted off, Heyward came in and got some valuable experience against one of the best offensive lines in football right now. Heyward is not going to unseat Brett Keisel when he comes back. Brett was clearly missed and is by they need him back in a big way.
Teams are running a lot of traps and stunts against the Steelers run defense. Normally they can combat that but this year for whatever reason it's getting the best of them.