This is what I've noticed, too and felt the Habs actually got it right sending him down.
He's gotta learn to do other things as at the NHL level he doesn't have the skill to float around for a lot of the game..
After
@Mrb1p suggested in a game last year to just focus on Roy and not the rest of the play, I did do that. I could see him make a ton of really smart little plays, especially in the offensive zone, that should make his teammates better. He also has a great shot which should help him score goals. Great offensive instincts too. I can totally get while people think if he can build around those things he could be a good NHLer.
The problem is it's not a quick wave of the wand to be able to build around these things. He's not a finished product yet, but based on the many prospects I've saw drafted in my lifetime, he's probably at a part of his development rate is starting to slowing down.
I hope this year he spends most of his time in Laval, and maybe gets some more time in the NHL towards the season, and that he has a big off season and shows up to camp next year and performs in a way where he convincingly makes the team. Because if he can build the rest of his game up around his current strengths, he could be a great middle-6 player.