A day after free agency opened, it's far too early to weigh the work of Marc Bergevin setting the roster up for next season, but over three years into Bergevin's tenure as general manager of the Montreal Canadiens, it's actually very surprising how much of the roster remains full of the products of the era of Bob Gainey and Pierre Gauthier.

To illustrate this, I've taken the Canadiens' organizational depth chart from EOTP, and coloured in each player orange if they were acquired either directly or indirectly (through draft picks acquired by that regime) by Gainey of Gauthier, and purple if they were brought in by Bergevin. In addition, members of the core of the Canadiens will have an asterisk beside their name.

Shockingly, six of the top seven forwards, three of the top four defensemen, and the starting goaltender, are all products of the previous management group. More striking than that, seven of the eight players I would consider core guys, were brought in by the previous group as well.

The only player that could be construed as a core guy that Bergevin brought into the fold is Jeff Petry, and while he's a great player, he's only one player.

This isn't to say that Bergevin has been sitting on his hands, he has still signed Brendan Gallagher, Max Pacioretty, Carey Price, P.K. Subban, and Nathan Beaulieu to new contracts, with Alex Galchenyuk surely on the way. He made choices to not move those players at crucial times, and Nikita Scherbak may end up being a core player as well.

However, for the most part, Bergevin's additions to the team have been around the margins, along with adding prospects. Bergevin also had a hand in several additions I'm counting for the Gainey/Gainey regime, such as Galchenyuk, Charles Hudon, Jacob de la Rose, Zachary Fucale, and Tim Bozon, but those picks were acquired by the previous group, and he admittedly had little involvement in the 2012 draft as a rookie GM.

Maybe Zack Kassian can earn a spot as a core player as well, if he works out in Montreal the way he couldn't in Vancouver, but the overarching feeling I get while looking at Bergevin's impact, is that he has only made one high impact roster addition in three years, and I wonder if that's enough.