Sorry to bust your homerism bubble, but the steelers and the ravens have had the best defenses in the last 10 years. **** Lebeau is arguably a better defensive mind than Belichick. His defense shut down manning in indy in the afc divivisional play-off game, while belichick's defense choked a year later in the afc championship game. The ravens have not allowed single 100 yards rusher in like forever. The have lost players like Bart Scott, AD over the years and still had a top 5 defense that shot the patriots down last year.
Belichick is not infallable. Is defense has been average to mediocre in the last 4 years. The nfl has changed, rules changes have made offenses more efficient. The read and react defense is becoming obsolete,.