There are many who believe Dilfer, for example, would have had much better career numbers if he would have been placed in a passing offense. He was almost always expected to manage a run-first offense, and he did it reasonably well. Nobody ever took notice of the fact that Dilfer actually had one of the stronger arms in the NFL----because it was just plain seldom used. Grossman can obviously sling the ball anywhere on the field, as could Dilfer. It's not the Bears style, nor should it be, and the fact that the Bears are capable of completing a 70 yard drive solely with the running game does not mean Grossman would not be capable of running a pass-first offense. The QB rating itself is one of the most overrated statistics in the history of sports. It says nothing about team strategy, team philosophy, what happened in the key plays that decided the game. You can literally post a terrible QB rating and be the primary reason your team won the game. That makes the stat useless.