There's a difference between saying a player sucks and saying that it's difficult to see his game projecting into the NHL. As I already said, Dumais struggles with physicality and speed. The Remparts nearly ended his playoffs early with a few solid body checks along the boards. Players only get bigger, stronger, and faster as you get closer to the NHL so he needs to figure out how to avoid that kind of body contact if he's going to have any kind of career as a pro. Developing those parts of your game are a long haul proposition and throwing a guy who can get lit up that badly into the NHL is bound to result in him getting destroyed physically before he even gets a chance to establish himself in the league.
Brindley I have a much easier time seeing as an NHLer. His game thrives with his skating and he has no issue with physicality despite his size. He's probably on the same timeline of another 3-5 years before he's in the NHL, but he's also a year younger than Dumais and I'd lean more towards the 3 than the 5 in his case. One more year in college, one year in the AHL and then I could see him pushing hard for the NHL fulltime.
How can you say a guy that can do this to Mark Stone shorthanded isn't an x factor?