Defense can be built back up really fast by utilizing the draft appropriately.
It's the offense that takes far more time, especially in the units involved in the blocking schemes. RB's have no idea how to be the final protection for #9. The TE working with the OL'ers also takes time. McVay used a WR in the backfield last season because he learned it better than any of the RB's. Everyone knows the problems involved in building a smooth functioning OL.
DL- Hvae no idea if DC Morris is going to run a 34D or 43 D. He just does not have any real 34 D components leftovers.
Under contract (43 DE) -Mike Hoecht/ Zach VanValkenburg/ Keir Thomas/ Earnest Brown are large linemen, not OLB'ers. The only OLB is Daniel Hardy. 34 DL- Johah Williams/ 3T DT Aaron Donald/ NT Bobby Brown/ T.J. Carter 5T DE/ Larrell Murchison 3T DT. This above might be a decent 43 DL. Snead going to need another NT to go with Bobby Brown.
DC Morris does have 3 ILB'ers in Ernest Jones/ Christian Rozeboom & Jake Hummel. It's been obvious that several OLB'ers will be drafted by Snead. to blend in with the 3 above.
It's going to be interesting watching what Snead does defensively in this drat to give me clues on what direction they are going but certainly, young rookie OLB'ers are going to be very hot additions.