Let's use an analogy:
Some students have to work really hard every year to earn decent grades. It's a constant struggle, and they do the best they can, but it never comes easy.
Others just "test well", or have things come much more naturally to them, and it seems much more effortless.
And yet, for kids in Scenario B, there often comes a time - often when they first go to college - when they find themselves in a very different tier of academic challenge, and it surprises them, sometimes to the point of getting overwhelmed. There is a period of time, sometimes a long period of time, when they have to adjust their thinking and approach to learning, and adapt to the new level of difficulty.
I'm not saying I know Mantha well enough to have any insight on his particular case, but the kid might just be used to breezing through various levels of competition, and need more time to readjust his approach. It doesn't mean he's lazy; he might just not be used to having to focus to the degree that NHL competition demands.
If that's the case, then once he gets his mind around the situation, he'll either put in the work to meet the challenge, or he won't. If it's the latter, THEN it's a problem, but I don't think there's anything to worry about quite yet.