I remember a pc with Parcells when he was asked why Ware was not getting more breaks on the sidelines and he just looked at the reporter and said "because the other coaches know when he is out".
Ratliff was the only break he ever got and he'd run himself out of steam facing 330lb guys over and over and he was a big guy himself but he was motor dependent.
You look at the stud D players on other teams, or even on earlier Cowboys teams, and they didn't let it rest too heavy on one player, they gave him help.
And before anyone crows about this DL, how effective is it without Parsons? Who is the behemoth in the middle taking up two OL?
This brain trust does not apply the same thinking to the DL that it does the OL. The GM looks for D stars instead of building a DL.