I'll call BS on this. My son has played Football since he was 6 years old (now 17) and the most basic fundamental taught to 6 year olds on defense, is learning what gap to fill. These players have been filling gaps for 20+ years (no pun intended) and now we are supposed to believe that they still dont know? That comes down to coaching! To me, that's a cop out, basic, BS, vanilla, coach speak response.