I think they have an interim coach because of Darcy's shaky status. Why hire a "permanent" coach now, when they could have a new GM soon. Let him hire the next coach.
Petulant is a fan first and an owner second. Pegula, Ted Black and Ken Sawyer will get together on the next GM with Pegula having final say, naturally. As a fan, he may once again look to the teams past for its future and hire someone with a history with the team, like Rick Dudley, Larry Carriere, or Don Luce. Coaching possibilities? Patrick Roy has been mentioned, but if you are looking for ex Sabres Craig Ramsay and Mike Peca come to mind.
It is going to get interesting in Sabreland.