I don't think it's a reliance on Poitras, he's more of an extra layer to Bruins center depth. As is, the Bruins can count on guys to fill top 6 roles for center and do an admirably job. Bruins just have Pasta on the wings as a guaranteed top 6 player. DeBrusk might walk, Marchand has slowed down and entering his final years as an NHL player. Guys like Heinen and JVR were plug in fillers. The Bruins are going to need at least two top 6 wingers, either internally or via free agency. I say they'll need 3, which pushes Marchand down to the third line next season.