Beaulieu has a lot of things going for as far as tools.
-He's an excellent skater
-He has stick skills and a good shot
-Offensive IQ is there
-He has size and has shown that he uses it
He simply needs to round out his defence and fill out his frame. Guys like Ryan Ellis had offense, but never the combination of being a PPQB and being a physical player.
While nothings guaranteed, as long as he develops a professional approach and a good work ethic, he is simply to talented and too naturally gifted to not be in the NHL, even if he only ends up being an average player. He could just end up being an all-the-tools-no-toolbox player, (which I even doubt, because he at least has a strong offensive IQ).
Beaulieu could certainly not meet his ceiling (or anywhere close), but after seeing him in those pre-season games, I find myself second guessing my worries about him busting. He put up good points on a bad team in Hamilton last year. I expect him to be ready in at least two years, as long as his body fills out. Right now he's 6ft2 195lbs, that's not too bad at all. If he can get up to about 215lbs he'll be able to start to establish his physical game.
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As for Galchenyuk, he's simply incredible. He is still so raw in talent that we haven't even seen what it's like when he puts it all together. The encouraging thing is he doesn't seem to be a player who rests of his talent and really works hard to improve and to hustle on the ice. We have great mix of a high ceiling and a mature attitude in a prospect; something that even if it isn't all that rare is something you should cherish and really make the most of.