‘Mittelstadt has become a key member of Buffalo’s lineup, so parting with him couldn’t have been an easy decision for general manager Kevyn Adams, but Byram is more than a worthwhile gamble. If Byram winds up finding his groove in Buffalo, the Sabres will have Rasmus Dahlin, Owen Power and Byram patrolling the blue line. That could be the start of a championship-caliber defensive corps. Grade — B.’