DE is listed only because there's a lot of unknown.
I think there are enough capable bodies there but between Miller (who knows), Epenesa (needs to become more consistent), Rousseau (can he take a step to becoming a top level guy), and then the lack of depth (Smoot - is he recovered from the injury? If so that's a big addition).
I think LB will be fine if Milano is in good shape and even if he is, I think we have some depth there. I also think CB with the 3 we have on the boundary plus Johnson in the slot we are in decent shape. Not a ton of depth but I think that is probably normal across most teams. DT I think we are in better shape than last year there with Austin Johnson an upgrade from Jordan Phillips. Plus the rookie.
Just a lot of unknowns at DE & S for me.