FWIW, our D is much closer than any of the others to being really good. IF we plug up the middle, and Ellerbe, Wheeler, and Jones play like 2012 vs 2013, we will not be as good as Seattle or SF but, potentially better than any in the AFC. Just a thought.
Several times over the last twenty years we have had a "good" defense, but we have never been close to being "insanely great" like the Super Bowl champion Seahawk, Raven or Bucs teams. Having a "good" defense isn't enough. If we are going to take the "defense" path to the championship, then we will need to be just as good as Seattle or SF.