I agree that Bell is the most important player on their team. If they are running the ball well, their offense is almost impossible to stop. It will be fun to see how the young guys on the D line handle not just him but the whole season against the run. I personally think we take a step back in our run D.
Also, the Steelers, should be at 100% for at least our week 4 game barring injuries. People forget that we faced a rushed back Big Ben in our first meeting last year and he was horrible against us. And in both meetings they didn't have M. Bryant or Ladarius Green. An offense of Ben, Bell, Brown, Bryant, Green, James and Rodgers/Coates/?? has the chance to be a no doubt #1 Offense in the league. Problem for them is that their injuries and suspensions seem to never although them on the field together.
I believe that is why we bolstered the back end so much on our team. Because if they ever do have their full disposal of players against teams, it's going to be extremely hard to stop and thats why we have gone that route in the off season.