In my third year we saw fire zones. Pete Carroll was one of the rare guys who did that. Now there's more dropping a cornerback and having a lineman drop off into coverage. That's been going on for several years. There's more sophistication applied to it and teams are much better at doing it.
Offensive lines have to be more aware of it.
When I came into the league people had three linemen and four linebackers. Now a lot of teams have changed from that to the Buddy Ryan defense with three inside guys covering to the Jimmy Johnson era with the four linemen and the three linebackers. I'm sure at some point it will go back to three linemen and four linebackers. It just cycles around. Teams are blitzing more and I think the scoring's down some from it.