Are you questioning the Supreme Leader's ability to diagnose broken bones? The Supreme Leader--the Enlightened One--knew the extent of the injury before it happened. If you have any doubts, His imperial guard would like to have a word.
Some of these guys--Bast, Johnson, Kunz--look like completely different players than they did even a month ago.
(And then Johnson takes a penalty as I'm typing...)
Link to Sanderson injury article. Basically there's no info yet.
https://www.sportsnet.ca/nhl/article/team-usa-defenceman-jake-sanderson-suffered-injury-win-canada/