Maybe I missed seeing this in the thread but I guess he was the last antivaxx holdout.
https://www.sportsnet.ca/nhl/article...art-condition/
Archibald was the last player on a Canadian NHL team to remain unvaccinated, which would have been very problematic had the Oilers planned to keep him in their lineup. Every time the team crossed the U.S. border and then returned to Canada — 13 times this season — Archibald would have been forced to quarantine for 14 days, away from his team and teammates.