If they could trade down and still draft Louis Nix, not only would he be an immediate impact on the line, he would dynamically change how teams have to face our defense, both in the pass rush and run stopping. One player, three lineman and 3 linebackers.
I think that a free safety like Clinton-Dix would also dynamically help the entire secondary, though I admit that it would take time to have an impact. But I also think they need to draft a corner too, which is why I say if they could trade down and draft for all three needs on defense, this team would be set.