Dylan Guenther’s composure evident in Coyotes, NHL debut

BOSTON — Dylan Guenther had a pretty good idea that he’d be playing at some point on this season-opening, six-game road trip. Coyotes coach André Tourigny had spoken to him before the team took off for Pittsburgh on Wednesday. When Nick Schmaltz went down with an upper-body injury in the first period at PPG Paints Arena on Thursday, however, it…