Is there a lamer sports story than the '72 Dolphins and how, whenever a modern team nears perfection, we hear about their undefeated season?
The '72 Dolphins only won 14 games. These days, teams play a 16-game season.
The winning percentage of their opponents that year was an abysmal .364. The best team they played were the NY Football Giants, who were 8-6.
Oh yeah, there was no salary cap.
So basically the '72 Dolphins going undefeated is about as meaningul as the 1942 Bears going undefeated: it's not meaningful. It's a different era with different players and a much, much tougher environment to try to do it in.