Whether it's something to worry about or not - it seems very similar to my prediction (which was backed by him not really wanting to go to the OHL). I've seen plenty of games and he just looks uninterested. It kind of sucks because during pre-season and his AHL appearance, he worked his ass off every shift. In the OHL, I really see someone who doesn't want to be there. But at the same time, I also see someone who thinks of the game in a professional aspect rather than the "all over the place" junior game.
I really think if he was in the AHL this year, he'd have 30-40 points without question and there would be a lot less people questioning him.
I'll throw out a ridiculous comparison. You're on a 1 month vacation with the extended family - 8 adults, 12 kids. One of the adults gets sick for 3-4 days. You're the oldest of the "kids" and you start playing cards with the adults at night because they're now short a player. The sick adult comes back on the 5th day and now you have go play at the kids table again. How much would that piss you off? I know it used to happen to me a little. If the adults were short, I'd play. If not, I was pushed back to the play with the other kids (who most were much younger than me at the time). It puts you in a terrible mindset and it sucks.
Add in learning a new culture, new country, probably living away from parents for the first time, and having a bunch of teammates who know the OHL is the end for them (aka PARTY TIME), and his initial refusal to go the OHL... and I think it's pretty clear that it's a hard season to judge him. But it's also a year of development that is getting pushed aside.