The reason why we were so successful was because we had guys in the secondary that could cover. … It gives you flexibility, it gives you versatility in your secondary to do so many different things to disguise, to play different coverages. … That’s all Bill Belichick wants. He wants versatility and wants the ability to play more man-to-man coverage and go after the quarterback and hit him in his mouth.
https://www.patspropaganda.com/the-reason-why-we-were-so-successful-was-because/
