I think it is good to look at those who really didn't help our cause last year, and see if we can't do better at those valuable positions, in no particular order.
DEFINITELY REPLACE:
NT: Green (need reliable AND effective backup to rotate with Raji)
DE: Wilson (need a starter)
DE: Wynn (need a starter, even though we're helped with Hargrove addition)
DE: Neal (need a quality end we can rely on)
OLB: Walden (need pass rush opposite Matthews. This is where we must add a wrecking crew pick)
RB: Grant (need reliable backup or starter)
C: Wells (Saturday is a great addition for 2012, but we will have to make a pick here to groom for 2013 - )
ON BUBBLE:
SS: Peprah (could use a top S talent here)
SS: Colins (depending on medical/team clearance)
OLB: Jones (could use more than invisible backup here)
Those are some pretty serious needs yet to be addressed for a 15-1 team. Muir seems like a good addition to backup Pickett, but Raji is so much more effective when he is rotated. I'd love to see us add a really good NT. I'm kind of looking at Muir, Hargrove and the anticipated Tollefson additions as great for our rotations as well as sound upgrades, but we still must add starters from draft.
Grant is just a victim of age and injury.
Saturday was an excellent pick up, and he will be great to help bring along a rookie C. I like Peprah, but I think we could do better (they did like MD Jennings and Levine last year). Jones seems a great ST guy and little more. If Collins does return, that would be huge. We could be fine keeping our bubble players, but those others really ought to go.
Upgrading those 7-10 slots should make us legit SB challengers this year.