As people know, I love reading about this stuff. This isnt about Narduzzi's defense specifically but about the Cover 4 in general. Drills down more into the specifics of the defense. If you want to know about other defenses, there are links at the top of the article to check out.
http://bleacherreport.com/articles/2094989-nfl-101-introducing-the-basics-of-cover-4
http://bleacherreport.com/articles/2094989-nfl-101-introducing-the-basics-of-cover-4
