I've seen what Quinn can do with a good DL, the best MLB and secondary in the league and what he didn't do in ATL, which is why he's in Dallas.
But is this any different that DC's with reps like Buddy Ryan, Jim Johnson, Monte Kiffin and Wade Phillips? Were their star D's that because of them or the stars? Marvin Lewis got his job based on his D in BAL and never sniffed at a D that good again. Same with Ryan in CHI.
Why didn't Landry have the Doomsday all the time or Bud Carlson always have the Steel Curtain?
The best story about coaching vs talent is the one of Belichick, the DC with NYG at the time, when they drafted Lawrence Taylor. Taylor's talent made him change his 3/4 approach to more of an attack D when he saw what he could do. Same thing happened in KC with Derrick Thomas.
I think Micah Parsons is Quinn's guy, the one he feels he can build his scheme around. Bobby Wagner was the unsung one of that D in SEA and the best player on the D and when he was not in the game, it was not the same D.
When have the Cowboys ever had a great D without an exceptional MLB? Is Parsons that? He'd better be for Quinn's sake because he is THE key to a turnaround from poor to average to good. And Quinn doesn't have that long to get there.