504Highlander

Saints had one of the best D's in the league in the 80's, but it wasn't enough.
The Ravens have one of the best D's, but they have not returned to the SB.

Good D is not enough. Teams that consistently get to the playoffs and SB, have excellent running games, as well as good D.

To help your running game, you must have a passing threat, et cetera.

To have a perimeter running game but no bruiser up the middle, lets your opponent, focus on stopping screens and slants.

With no TE threat, DB's can smother the WR's, and so on.

The elite teams get this and configure their teams to be effective at all of the above.

Perimeter runners, between the tackles runners, receiving tight ends, blocking tight ends, all help to keep the opponents D honest.

I don't feel like we have all these bases covered at the moment.

If at first you don't succeed, try, try again.