I expected the Bruins to take a step back with Bergeron & Krejčí retired. Losing your top 2 centers can be devastating for any team, but the Bruins managed to remain competitive despite that. Marchand also seems to have taken the captaincy with stride. Might not be a big fan of him, but he's definitely proven why he's earned the "C". Dude's a locker room leader, he has that ability to rally a team.
As for the Leafs, I don't know what to say other than if they lose this series, this could perhaps be the last time we see this core together. MLSE has a new CEO, you know the discussion in the offseason with Shanahan is going to be "You have all this skill, all these players making $11M and no playoff success to show for it.". I think there's a great likelihood Keefe gets fired. Shanahan himself might get canned if MLSE feels they've had enough.