to hard to tell at this point but I'll go with OL. The right side of the OL should be fine with Porter and Alexander, not sure who the Center will be, and not sure if Collins will stay at LG or move out to LT. Ethan Pocic the freshman looks to be a solid OT but we won't know until he puts the pads on.
On the DL we have Rasco and Johnson coming back. Those are about the only two that saw significant playing time last year. The rest are still all ?.