I think the expectation is for a 4th overall pick he wouldn't just be having a standard season - he should be dominating. People watching the team have reported he's been very so-so defensively.
WJC is a poor indicator of future success, but he definitely looked bad in his own end.
I don't know, he was on the ice for I believe two goals against the entire tournament and Canada gave up around 16 goals. He also seemingly replaced Smith, Bahl, and McIsaac as the primary penalty killer among defensemen for Canada and the coaches gave him more and more ice time as the tournament progressed.
He routinely exceeded 20 minutes TOI for Canada during the last 5-6 games and Canada's defense improved tremendously on the way to a gold medal. I don't believe that he was on the ice for any power play goals against. The coaches for Canada essentially treated him as the primary shut down defenseman as the tournament progressed, while the roles for Bahl, McIsaac, and Smith were reduced.
His point production is essentially the same after the same number of games as last year in the WHL (.90 ppg through 40 games versus 1.05 ppg through 67 WHL games last year).