I'd say the opposite. I think Orton can detect the pressure a lot better than Rex, and sets up the blocking scheme to handle it. That's the key. Grossman was at his best picking apart defenses that sent 4 pass rushers. Once teams saw he could be rattled, they messed with him, and he never adjusted. Orton has been ducking and diving away from pass rushers in every game. It kind of confuses me, because you're right, but I distinctly remember Grossman avoiding the rush in his first games as a Bear. After that Minny injury he stopped moving around. I don't understand why, if you are rattled by the rush and you are trying to avoid injury, that your solution would be to become a statue in the pocket. Doesn't make sense to me.