First of all, you should stop to look at the media's top free agents, that's no Buffalo's way, remember when they bring here Poyer, Hyde, Beasley or Brown (both WR more recognized), Lorax. Only Morse was among the top C's at FA and several years ago Mario, but that usually didn't happen.
I'm looking for someone like Aaron Lynch, i remembered him from SF a couple years back, i think he signed with Chicago and really don't know much about him recently.