Apparently, Cassidy wanted to try a Lindholm, and Carlo pairing earlier in the season but wasn't able to when Lindholm missed some time with an injury. It's no surprise he wants to put Grzelcyk and McAvoy back together, though.
For defence pairings that played a minimum of 400 minutes together in the 2021-22 NHL regular season. McAvoy and Grzelcyk led the league in Expected Goals % (the probability of any shot taken to result in a goal), Expected Goals Against, Expected Goals Against Per 60 minutes, and Expected Goals For Per 60 minutes.
So basically, McAvoy and Grzelcyk were THE best d-pairing in the entire NHL in producing scoring chances for the Bruins, and limiting scoring chances against the Bruins when they were on the ice together.
