Brockers likely isn't resigned after this year couple that with depth is always needed since Wade likes a solid rotation and guys flexible in that rotation. Adding another DL is pretty obvious since we lost one and haven't added any thus far and likely won't with our cap situation.
I don't disagree, but we could make the following statements:
Adding another CB is pretty obvious since both are starters could be elsewhere next year
Adding another OL or two is pretty obvious since we have zero depth
Adding an ILB is pretty obvious since we have zero depth
Adding an edge rusher is pretty obvious since Fowler's contract is up next year
Adding a RB is pretty obvious since Gurley's knee is a question mark
Adding a S is pretty obvious since Weddle is a short term solution
What the DL has that none of these other positions have though, is the best player in football. I could see us drafting a DL, for sure. But I could also see them being less willing to do so, at least highly - since we have needs or future needs at what feels like every position.