Another day, another article with insight into the 3-4 defense. Great stuff and really explains a lot in terms of why it’s so hard to find OLBs that could fit the Pats system.
The key to the success of Belichick’s style is flexibility of personnel. To be able to switch from a 4-3 to a 3-4 to a dime defense and all points in between requires versatility at nearly every position. Players have to be able to run and cover and hit. Linemen have to be strong enough to hold the point in the 3-4, but get upfield in a 4-3. Defensive backs have to be very good in zone coverage but competent in man coverage when needed. It requires special skills, but also an above-average football IQ. Compared with the base Dungy-Kiffin scheme, which probably started with as little as three or four fronts and a couple of zone coverages, Belichick’s hybrid is a maze meant to confuse and confound.
Another important difference in Belichick’s defense is philosophical rather than playbook-oriented. Most coordinators identify the weaknesses of an upcoming opponent and game-plan to take advantage. Belichick specifically seeks to take away the strength of an offense, forcing it to operate out of its comfort zone. In a league where you may face a power offense one week and a spread offense the next, the versatility of the multiple front playbook is the only way to pull off such a philosophy.