The most significant thing for me is when you look at the DLs who have joined this team, almost every single one of them became a better player while here (Quinn, Donald, Brockers, Hayes, Sims, Westbrooks, Fairley, Easley, Langford, Cam Thomas, Longacre, etc.). Even the guys who ended up leaving (Langford and Fairley, for example) showed they became better players while with this team.
That's a guy who is doing his job. There's a reason why he's thought of as one of the top 5 DL Coaches in the league.