Everybody in an NFL organization, including the players, may have designated titles, but their roles and responsibilities blur when you get down to the work that is actually involved. As a recent example, Mike Munchak was the team’s offensive line coach, but he also helped to put together the team’s gameplan pertaining to the running game.
All coaches, at least on a team like the Pittsburgh Steelers, have the freedom to offer their input wherever it may be useful. As head coach Mike Tomlin frequently says, he doesn’t care where good ideas come from, because it’s all about winning.