Grizzly sez,
.....
I honestly cannot remember such a vanilla defense being this great. Maybe those 70's Steeler defenses, I guess, but I was so young that I don't remember. Very little blitzing and few gimmicks - they pretty much play a plain 4-3 with some substitutions on passing downs. It'll be interesting to see if Quinn can repeat it with the Falcons or if he can only do it in Seattle because of the extreme level of talent and speed.
.....
The 1971-73 Dolphins played a base 4-3 defense, and relied on an all-world secondary, freeing up the front 7 to "cheat" on stunts, stacks, etc. Their front 7 was good, but not super intimidating.
By a strange coincidence, that team also had a power tailback* who advanced the state-of-the-art in terms of being hard to tackle. Larry Csonka would veer towards defenders in the secondary, sometimes literally throwing punches at them as he arrived. He was flagged in a Super Bowl for illegal contact. "Illegal contact, my left cleat," he thundered, "It was a right cross."
Jack Tatum, in They Call Me Assassin, gave props to Csonka and only Csonka among offensive players. "He warded tacklers off with those elbows," Tatum said. "I was never able to sting him." But Marshawn is an improved version of Csonka, faster and more elusive.
They had a super-efficient and super-unassuming quarterback, Bob Griese, whose stats were derided, but whose "percentage play" was off the charts. It created a synchonicity that led to the last undefeated season in the NFL. I don't relish the comparison, but the fact is that the 2014 Seahawks are an eerily-close comp for the Csonka Dolphins.
Sometimes you need three legs in place, if a stool isn't going to fall over. Secondary-based defense, unstoppable power runner, quarterback who plays chess.