I actually think comparing his potential to Voracek, to any degree, is lazy, bb.
He has physical tools, but his hands are atrocious. Watch him handle the puck. It's like he's slapping at it, as it constantly rolls off his blade. Jake has some of the softest hands of any winger in the league navigating through traffic. And PJ's hockey sense is a disaster. People call Voracek a dumb player the way Hartnell was dumb because he took bad penalties. Neither are Patrice Bergeron, but you don't impact the game like they do/did and be dumb because of (in Jake's case) turnovers trying to make plays happen. Elite playmakers are not dumb; they dissect defenses for openings. You can also be intelligent in different ways. Jake is a smart player who does dumb things now and again. Yes, he is no Selke caliber player either.
This is a roundabout way of saying Puljujarvi has rocks for brains and stone hands. Why that is deemed "upside" to bet on is beyond me. He has more in common with Magnus Paajarvi than Jake Voracek. People can say he went 4th overall, point to his WJC playing with 2 actual stars, point at his physical tools, point to Edmonton being a poor developmental team, but you need things to work with that I am deeply DEEPLY skeptical Puljujarvi posseses.
Saying a future bust has potential is the oldest sell in the book. Edmonton has developed good players. Sometimes a Puljujarvi or Yakupov simply is what he is on his own merits.
