I hope that all it takes is a coach to help him out with this part of his game or experience will change him with leadership qualities aka the Ovechkin comparisons.. but that might be wishful thinking…Ovechkin was/is lighting in a bottle compared to Barkov in every sense of the word since his rookie year. Barkov might honestly need to simply get stripped and be a follower.
You and some others seem to think that it's captains job to get all the players to play in certain way. It kinda is in a small way, because captain leads by an example, but it's coaches job to say how they should play, and what's the example captain needs to show. Is it intensity and urgency? Or to play responsibly in both directions and avoid mistakes? Did Barkov show a good example for the others? I think he did. His line created much more opportunities to score than any other line, while giving away very few chances to the opponent. I understand that it would've been ideal example, if he could've picked the team on his back and put on a Barkov show, like he did many times in the regular season, but with playoffs it's irresponsible for a center to overcommit on attacks - especially if there isn't a good defending winger on your side. Therefore it's easier for someone like Kucherov to step up and make those necesserary points.
Which leads me to this... I think comparing Ovechkin to Barkov is like comparing cats to dogs. Ovechkin is forward, Barkov is center. It's much easier for Ovechkin to play with high intensity and run around the rink giving away big hits, than with Barkov who needs to glue the line together and worry about the defence. And would we have won Washington, if we would've tried to play their playing style? You'd be more on the nose comparing Barkov to Bergeron, keeping in mind that Boston also has a different playing style than we do. Recardless to that, it's not Bergeron that leads the team with tackles, other guys do.
All in all, I think we fell mostly on our powerplay. We couldn't make it creative enough. And that's purely a tactical element. Coach makes the strategies and decides who plays where. Our powerplay was probably studied pretty well by the opponent and we couldn't mix it up.