My theory is the older the player the longer it took them to get up to speed in the playoffs. Having an abnormal break, a make-shift training camp, right into meaningful games (even the Round Robin) in the middle of the summer. Didn't help Bergeron's cause.
The guy is 35 going on 36. He's still a heck of a player because he thinks the game so well. But he's not the Bergeron of 3-4 years ago, let alone a decade. The drop-off isn't massive, it's more gradual, but it's there. Which is why I don't think they can do what they used to do which was put a lesser or inexperienced winger with 63/37. I think they need a solid player on their RW.