I enjoyed the article - thanks.
For me it is to early to make the comparisions by player or by team. There is no reason to think that the defense will not be as good or better.
The 2009 defense made the stops on third down and got off the field. They played phyiscal and brought it on every play with a high level of confidence.
One things for sure. The season will answer these questions and more and it'a almost here.
To compare the two defenses at this point is not fair but it is fun to look at. All we can really said about the 2011 defense at this point is the potential is there for a great year.