What we learned: A.J. Greer is making his fourth-line case

The first cuts are quickly approaching, and the Boston Bruins’ season-opening roster is slowly taking shape.

Tuesday’s home preseason opener against the New York Rangers marked the first sight of Anton Stralman in game action after the veteran defenseman arrived on a PTO late last week. Other notable exhibition debuts included Charlie Coyle, Trent Frederic, Craig Smith, Hampus Lindholm, Mike Reilly, Brandon Carlo and Jeremy Swayman, to name a few.

It also brought forth another preseason tilt for Oskar Steen and Jack Studnicka. Both young forwards provided the Providence Bruins with timely offensive production during their first few seasons of professional hockey. Still, neither could secure a…