The issues on defense were poor play by senior DBs...and others... when we have a senior DB get blown up by the bubble screen and the DC refuses to play younger more athletic guys...It is on the DC... Also Joe Speed has coached LB and safeties... this year he coached Cornerbacks who were undersized and loved to act like thugs in the locker room... CTR is to blame not the two assistants who identified and reported the issues..
Also our Line play has stunk since Coach McCollum was moved to safeties... did you notice how CTR moved speed and Mac to A poor backfield.... but did want to accept responsibility for poor DL and LB play....
I think you put Speed back at safeties (we're he was in 2014, and watch AN Gray flourish) and let Coach Mac be with the ILB.... and watch that play improve abd Coach woody can add a dline coach and he can Coach OLB...
I think we will be a top 50 defense next year maybe even top 30