Reports from sources close to the Patriots indicate that Belichick is going to sign all 3 so he can cut them all before the season begins to send a message to the older guys.
I would like Sharper, I don't think he'd be a starter but he'd be great depth. Very smart player, good with the ball, even better at getting it. Aside from his age, I don't think there are many negatives about him from a football perspective. He'd probably sign for the vet min too.
IMO this whole thing is to keep our current safeties looking over their shoulders, Meriweather is more than adequate.. but keeping focused seems to be an issue.
What BB is doing here, is the same modus operandi that has taken place here for a while, filling the rolodex of players that you like and know in the event of a significant injury.