Pass rusher
OL
DB
WR

My guess is they re-up Adams, modify (i.e., extend w/ more guaranteed $) Cobb and Jordy's contracts to drop their cap numbers, keep Allison and hope Yancey/Davis eventually pans out.
The injuries on the OL and secondary have exposed the depth. Murphy outplayed Spriggs and the Randall/Rollins draft looks pretty suspect.
Pass rush makes a huge difference -- you can get away with average DBs if you can consistently pressure QBs without needing to blitz much.

Is this HaHa's last year? If so they'll have to make a decision at S.