Zone blocking scheme outdated?

[Fonz the Boss]

The reason why we cannot blitz as much as the Jets is because we dont have a secondary that can stay on an island playing cover 1 on receivers. Frank Bush tried blitzing Sanchez on almost every third down and you saw what happened. That is why the Richard Smith schemes involved little to no blitzing. He knew he didnt have the defensive personnel for the more complex and exotic blitz packages.