I think that weight would be a stretch. He's already quite thick... there gets a point where it gets in your way, and can stress your body, causing injury. Just physically maturing adds strength, even if you don't add lbs.
5'10", 190 is plenty, especially once he matures. A lot depends on intangibles, of course. Some players are just stronger on their skates than others, then you throw in the ability to see the ice and situations ahead of time and adjusting, common sense(some don't have it!), quickness, toughness.
It seems that Bedard would test very high on most of the intangibles, but let's face it, you're not drafting him to be your 3rd line grinding winger. He is most valuable as a scorer. You stick out a protector on the ice with him if need be.
I would think the only mild worry about Bedard is if he doesn't develop more quickness and speed, so he can skate away from checks, and into scoring positions. There is nothing worse than seeing your prized rookie get caught from behind on a breakaway by Ryan Suter or Marc Staal. We already know he doesn't have good size, so he'll need that speed, or at least, quick feet.