Basically, DB's main theory for pass defense has always been the pass rush. It worked well in the days of Darrell Watson. But after losing Watson things went south and stayed there. Watson, who was probably the best defensive coordinator in the state at that time had a special knack for knowing just when to bring the pressure. And he could do it with consistency. Nobody really noticed how bad the defensive backfield was because the QB was usually running for his life and couldn't get a decent pass off. You might ask, well if Watson was such a great defensive coordinator, why didn't he just fix the defensive backfield back then. You have to understand that the "good ole' boys" were large and in charge back then also. And with the guy that was coaching the backfield at that time, you had to play along to get along.
Dude, you know a lot about DB and I respect the truth...the DB faithful will never change the good ole boys system....