The size, speed, and previous playing time of our secondary, is what labelled them as the strength of our team in pre-season. I think this answers the OPs question.
If, If, If.......we bring in a quality defensive staff, there is hope, considering: the young DL grows up, the even younger DL recruits contribute depth, and the LB corp of Thomas, Jackson, Tatum, and Willis reach their high ceiling potential. Thomas and Jackson are proven veterans, Tatum, a star in the making, has a bit of experience this year due to injuries to starters, and Willis may one of our best in a long time (remember Roof was pretty damned effective as a Fr). As for the OL, we need to stay healthy. The 2020 class OL will be Juniors (note, yesterday ND started a Jr and Fr on the OL) and many top programs start Soph OL.
I still have hope that CGC combined with quality Co-ordinators, will be a winning combo. However, the excuse train is pulling out of da station with more and more donors on board.