Not necessarily an opinion formed from that tournament, but I always found him a step behind the play, always chasing the puck rather than reading where it's going to be.
And I think he gets away with it, for now, because of his skating. I question if he has the hockey IQ to adapt his game against bigger, faster competition.
MacKinnon faced exactly these struggles in his first few years in the NHL and as a 17 year old at the WJC, and his solution was, instead of adapting his game, to double down on it and develop into a player who is stronger and faster than everyone on the ice. But he's a genetic freak of nature, that's not an avenue that any MacKinnon-lite player will be able to follow. So Newhook will have to find a different answer.