Seems to be a pretty steadied belief that Buffalo is in need of an improved offensive line. Although, I believe Guard is a position that can be improved through free agency. There are many more pressing needs to be addressed in this years draft (LB, WR, TE, etc.) and a boat load of guards are hitting the free agent market in '14.
http://overthecap.com/freeagents.php?Position=G&Year=2014
Maybe one of these guys can be the answer.