My opinion on Jaraventie...
He has some skills and hands, has potential to score. But he's soft, isn't physical, and isn't a speedster so he has no chance to be a 3rd or 4th liner if he makes the NHL, he has to be in the top 6 in a scoring role. Injuries are a concern.
The other 2 guys, I've never heard of, which is typical as I don't know much about other teams' prospects.
Chiasson was an ECHLer, with just ok stats, so I don't give him much of a shot.
Does Bourgault have traits that point him towards being a potential 3rd or 4th liner in the NHL? He doesn't appear to score enough to be a future top 6 forward.