I know Junior Seau once said that this defensive scheme is different from all others in that in tells players to take on blocks rather than going around them, and I know that at one point the Patriots were the only team to run pattern matching as their primary coverage scheme. I know everybody says the scheme is complex, but how complex? Would you say that the Patriots' defense is one of or even THE hardest to learn in the NFL? In terms of complexity and amount of knowledge needed, are there any defenses that are harder to learn? Oh yeah, and does anybody have any quotes from players or former players telling how difficult the scheme is to learn?