It just seems weird that everyone always mentions DL and OL as issues but then lists LB and DB as being in good shape despite the exact same "potential" issues. They're really all in the same boat. Lots of talent and potential but a bit inexperienced going into the 2nd unit. LB is actually far worse than DL in this regard. DL has a lot more experience. LB might actually be the worst position group on D as far as depth based on a combo of talent, potential and experience.
I also think it might be a misunderstanding for people to say there will be more injuries against a tougher schedule. I don't think there's a correlation. Anyone could get injured at any time against Appalachian State the same as against Ole Miss.