coverage not there
The Blitz is most effective when combined with press man coverage. The goal of the Blitz is NOT to just sack the QB but to pressure and throw off the timing of the play, force the check down, and prevent 3rd down conversions.
In order to be a successful Blitz team you need physical corners like we used to have i.e Surtain and Madison (5 years ago).
JJ defense was predicated on stoutness in the middle of the line of scrimmage, speed edge rushers, physical press coverage on the corners, speed at LB to cover backs and TE's, and physical safties to lend run support.
It worked because of the personnel.
Our current scheme does not lend to successful Blitzing on the frequency we use it because we don;t have the CB's that can physically match up with WR's.
Our personnel is better suited to pay 5-10yds off the ball, dropping into Zones, and coming up to make plays. That's it.