Listen to our Coach. Even Belichick says Jimmy's secondary scheme could bewilder today's offense.
Jerry should be ashamed that he let this brain trust out his building.
Jimmy's 1992 Playbook is on the Internet and the defensive side of that playbook is 20 pages long. Dick Nolan's playbook from the San Francisco 49ers is also on the Internet (i.e. the only other person to have coached the Flex defense outside of TL) and the defensive side exceeds 100 pages long.
Jimmy's teams played Cover 2 period. Jimmy's defenses emphasized speed to the point of attack, and back when players were bigger, he would use college linebackers at DE, college safeties at OLB. His only true LB type would
usually be the MLB.
Understand, the Miami 4-3 that Jimmy was a part of is now in the DNA of every 4-3 team in the league, because it's relatively easy to coach. That isn't because he had dozens of secondary adjustments, because he did not. But it was also new when he coached, and OCs were not used to it, unless they came from the college ranks.