*Was* injured, if it's all healed up then doesn't really matter. Often NHL players will decline if they have "something" that needs time to heal, but if Laine is all good to go, he should. It's hopefully the last time in a long time he's available for the worlds, in his home town no less.
Laine won't put conditions on his participation (like those would work with Jalonen anyway
) and no way Jalonen plays him in a different position than he thinks is the best for the team. I really doubt it'll mean Laine at center, but I have no idea on how the roster is shaping up to be.
As for his play in CBJ this season, for the 55 games he did play, that was overall pretty impressive performance. I'm not sure people even realize how much better the team was with him on the ice over the course of the season and you could pick pretty much any player on the roster and see their numbers were better with Laine, that includes Gaudreau, Marchenko, Roslovic (especially!), focusing on players whose usage was similar with / without.
I wouldn't put too much stock in trying to evaluate individual player performance on a season like this and like we've seen with Gavrikov & Nyquist, the team around you makes a huge difference, that includes both the roster & coaching. Still, managing to be somehow net positive 5v5 with a team that finishes 31st is somewhat impressive and the underlying metrics were up there as well. Something I haven't seen mentioned is Laine actually had the lowest shooting percentage of his career, which of course is not a positive thing, but what is positive is getting good results despite it.
Gaudreau especially has a lot more to give, it was evident comparing him out the gate and later in the season, I wanna see a full 82 game season of the Gaudreau we got for the first 10 games or something.