The Bruins are deep on the left side of the defense with Hampus Lindholm, Derek Forbort, Jakub Zboril, Mike Reilly, and Matthew Grzelcyk when he's healthy. On the right side the club only has Charlie McAvoy (out till November) and Brandon Carlo as NHL regulars, along with Stralman and Connor Clifton.
McLaren is right on point here as Boston will have offload a left-shot defenseman, and both Reilly and Grzelcyk make around $3 million per season. Grzelcyk is still out for a while as he recovers from off season shoulder surgery so it would be more difficult to move him.