https://www.diebytheblade.com/kyle-okposo-explains-injury-says-thank-you-in-letter-to-fans/
In fact, it is likely that his leadership style was formed and influenced in the aftermath of his concussion.
That's the point about "veteran leadership"... It's not just about how well you play hockey. It's about the experience a veteran player has- all the situations he's been in, all the things he's seen, and how that shapes his approach to the game and to the locker room.
Dahlin, Tuch, Cozens, are all leaders in their own way, but they don't have the level of experience that Okposo has. I think it's fair to say that this season will be as much about him shaping Dahlin, Tuch, Cozens and whoever else as it will be about leading the team.