Butler, 24, played all three of his NHL seasons with the Buffalo Sabres, posting 5 goals and 31 assists in 155 games.
Calgary acquired Butler, a restricted free agent, along with Paul Bryon on a draft day trade with the Buffalo Sabres in exchange for Robyn Regehr, Ales Kotalik and Calgary’s second pick in the 2012 Entry Draft.
Not only is it a great idea, but if you don't [start using analytics] you're going to fall behind. You have to be on the cutting edge. It was [Arizona Coyotes assistant general manager] Darcy Regier who said, 'If you didn't invent it, you have to be the second- or third-best copier, because if you're fourth or fifth you've got no chance.'
— Detroit Red Wings coach Mike Babcock on his interest in advanced statistical analysis