We could still add players to future's contracts. I don't think we came close to maximizing that group, unless I missed something.
We can also sign players who have been released/cut. You can sign those guys anytime, just like guys who get signed mid season off their couch.
If I had the magic pen, I would sign Vontae Davis right now to a reasonable 3 year deal, but only to play free safety, not a CB contract. IMO, Vontae projects at safety just as well Devin McCourty ever did, and his move was massively successful.
Vontae is a viscous and sure tackler, and when a 100% his coverage skills are elite.