Making the cut
With the key injuries to start the season, the Bruins have some spots up for grabs. Instead of the usual Marchand-Bergeron pairing, Montgomery could opt to pair Bergeron with someone like prospect Fabian Lysell to give them the best possible shot to impress at the outset. They'll also need someone to fill McAvoy's spot with Hampus Lindholm (likely Brandon Carlo), presenting an opportunity for Jakub Zboril. There's no question that to start the season, the Bruins lineup will be in flux.
Most intriguing addition
Zacha has never quite played up to his draft slot after being taken with the No. 6 pick in the 2015 NHL Draft by the Devils, so a fresh start might be good for the forward. Zacha, who is one of five Czech players on the Bruins, was acquired in a trade for center Erik Haula on July 14 and signed a one-year, $3.5 million contract as a restricted free agent on Aug. 8. He's coming off an NHL career high in points with 36 (15 goals, 21 assists) and could get a chance to play in the top six with a high-skill center, potentially as an audition to replace either Bergeron or Krejci down the line.
Biggest potential surprise
It would be asking a lot for Lysell to make the jump from Vancouver of the Western Hockey League to the NHL at 19, but the Bruins have liked what they've seen out of the forward in his brief time in North America. He had 62 points (22 goals, 40 assists) in 53 games and has shown flashes of being a dynamic offensive player, which the Bruins could use. Could he make the jump like Pastrnak did in 2014-15 despite needing to gain some strength and bulk? It's on the table.
Ready to break through
This could be the chance for Zboril to prove the doubters wrong. Before he tore his ACL in December, ending his season, he had started to show flashes of the ability that caused the Bruins to pick him at No. 13 in the 2015 NHL Draft. With McAvoy and Grzelcyk out, there will be plenty of minutes at defenseman at the start of the season and Zboril should be called upon frequently.
Fantasy sleeper
Lindholm, D (fantasy average draft position: 145.8) -- He will likely bring at least short-term exposure to Boston's elite forwards David Pastrnak and Bergeron on the first power play and should benefit from the eventual return of McAvoy (shoulder surgery) on the top defense pair, making Lindholm a fantasy sleeper who could shatter his previous NHL career high in points (34 with Anaheim Ducks in 2014-15). -- Pete Jensen