Which proven players should the Sabres add to bolster their bottom six?

This is the fourth story in a five-part series detailing questions facing the Sabres this summer. Rehiring Lindy Ruff as coach was the first item on a long offseason to-do list for Buffalo Sabres General Manager Kevyn Adams. Ukko-Pekka Luukkonen, their starting goalie for much of the season, needs a new contract. Henri Jokiharju and Peyton Krebs are restricted free agents.