Some is coaching, like DBs letting WRs get behind them ALL YEAR. But to me, it's personnel. This is the weakest LB corp we've had in years. Many complained about Auggie Sanchez, but he at least was a smart, physical guy and covered the middle well (yes, pass coverage was weak, at times). Sawtelle is good, but is a level below. McGee is a stud, but small to rely on. Reaves is a very good DE, but still struggling to learn the position on the fly.
My take on the DL is we obviously miss Senat & Hector, but Livingston, Bronson and Jackson seemed to have peaked last year. The good news is the young guys at DT show a LOT of promise.
I think we have some good young talent in the secondary, but still prone to getting burned. It's hard to blame coaching too much on the personnel...since most was inherited. That said, if you're undersized or weak in certain areas, coaching can help with schemes to try to cover those gaps. Tulane will try to run on us all day. Hopefully we've learned and can pressure & stick the QB.