They could use a high-level EDGE. Those consistent disruptive plays that anchor opposing drives are missing in the defense.
Gailey and McVay did good work attacking the weaknesses they could find, and it looks like the staff gets a little flustered before adjusting, but that's is more the level of adding and improving and fine-tuning, not overhauling. We know the pieces of a top-5 D are still there, they didn't suddenly all turn to poop.