Honestly, that's probably good enough and probably where he would be the last couple of years if his stats weren't inflated a bit by the team around him. A ton of guys in the Q have inflated stats (most come from Halifax and Quebec this year) so I wouldn't be too worried about seeing a slightly better than PPG stat-line from Huberdeau.
And if he wasn't trying his hardest, I wouldn't blame him at all. It's just human nature. He should be at a higher level and his team has regressed. Hard to get motivated by that. It wouldn't even be a conscious thing, either. I would love to see what Grigorenko could do on a terrible team rather than getting everything handed to him so far in his CHL career.