Wilfork wouldn't restructure, and no one's paying him $7.5M per. If his medical shows sufficient progress to warrant projecting him back to play by the regular season, I'd offer him a 2/$5. Because he's not going to be ready for camp, most likely, or even the preseason, and might miss the early games. But if he was even 90% he'd be a huge push in the middle.
Forgot about Porter. Damn. Course, Cap'n is still out there, as are both Cromarties. A lot of decent CBs closing in on 30, so who are the young up ad comers? I'd look at the Bengals' Brandon Ghee, maybe the Colts' Cassius Vaughn, a few years younger, faster, guys who can be coached up and have their feet wet. Why I liked N. Carroll.
Munnerlyn signed with Vikes 3YR/11MIL. Richard Marshall was
available, but he just signed 1 year deal with Bolts. Still some guys out there. Tarell Brown. Walter Thurmond. DRC. Ideally, I'd take either of those first two guys, particularly Tarell Brown. Relatively young guy (29) with a lot of starting experience for the Niners. Haven't read any reports of teams knocking his door down. Niners supposedly want him back, but are limited in what they can offer. Read on PFT or somewhere that they're in the 3 million per range.
3YR/14MIL probably gets you a plug and play guy at a critical position.
Thurmond is a little younger and is definitely my second choice. Little younger. Similar sized. Probably about the same kinda money. Getting more interest (supposedly) in FA, tho.