The Sabres already have three pending UFAs (Tallinder, Lydman, Paetsch) that they'll be pushing to get something in return for, if they don't plan to re-sign either. There's no way that Regier would have any interest in an UFA rental like Sutton, especially when he does nothing to address one of Buffalo's most pressing needs in helping the power play.
I can see dealing Biron to Buffalo for a cheap pick, he is much better than Lalime and lives in Buffalo, Sutton is much better than Montador. Montador is a pylon and the worst fighter in the league. I always regard Buffalo with a solid defense, so not sure if making a deal for a UFA like Sutton even makes sense.
Buffalo is a hard team at the deadline because they are not a sexy team and yet have few to no holes. Which usually means they tank in the first round in the playoffs or surprise everyone.