I'm OP of this thread (keep in mind, STL hadn't drafted him when I made it but check the OP).
Put yourself in Walman's shoes:
-When he accepted the US invitation, he had virtually no chance of making the Canadian WJC team.
-He was pursued by USA hockey, he didn't reach out to them
-He accepted their offer, considering he is technically eligible, he had a good shot of making the team, and a much better shot of not making Team Canada at the time
What would you do? You're a guy who wasn't even supposed to be drafted, exploded your draft year and climbed the ranking. Then had a solid rookie year in the NCAA and would have been an after thought for the Canadian WJC team but were offered an opportunity to play for another team, to gain that national exposure.
Any person claiming to have so much pride that they wouldn't have done the same is lying.
Let's keep in mind for Walman, at the time, the decision was either:
A) Probably make the US WJC team
B) Almost certainty get cut by the CAN WJC team
It's not as if he had a good shot of making both teams, at the time, but decided to join the one he has a better shot of making.
By the way, Walman is up to about 205 now.
He was at like 155 before the draft, put on about 20lbs from working out & eating big for the draft to reach 175. He's now up to 205, and very lean.