For me, if we re-sign or replace all our free agents (some hopefully with upgrades), we will have a top 5 Defense again next year, a top 5 Defense when healthy. We need to add a playmaker at LB as our highest off-season priority. We also need better backups at CB and S. I disagree with many that don't believe that we have a top Defense.
DEFENSIVE TACKLES
We are already a top 5 Defense when Williams and Spillane are healthy. The DT's are among the best. Sure, we can upgrade Gregory with a veteran and have an even better 6-man DT. Durden and Farmer are good backups.
Did any RB even have 50 yards when they were both Williams and Spillane were healthy?
==============================
SECONDARY
Vrabel seems to believe that no one gets injured. The safeties and top CB's play 100% of the reps. Jones plays 100% of the reps at nickel. We're a top secondary when they are healthy. We NEED to have better backups than Woods, Battle and Pettus.
===========
LINEBACKER
Yes, we NEED to add a playmaker, presumably adding pass-rusher ro two. Of course, an upgrade to Ellis/Gibbens would be great.