According to the bills' roster, Hairston is an RFA, so he's most likely back. He's a good swing tackle. Marrone said good things about Richardson at yesterday's PC. I won't be surprised if they move Glenn inside, Henderson to LT, and give kouandjio a shot at RT.
With an unsettled QB situation, I doubt carpenter or iupati would come unless they throw a boat load of $ at them, which I doubt. Best bet is to grab a G in R2.
Bills need to resign Searcy, Hughes, Easley, and Wynn. I'd like to see them go for a TE in FA too, someone like Clay from Miami.
With the QB situation they need to have a power running game. I'm torn about CJ, but they might be better off finding a big horse at RB.