Right now, I don't think he'd dominate the AHL. He's 7th among forwards on his Liiga team in PPG for forwards, so he's really only a middle six player right now in Liiga.
What makes you think he'd be more than that in a better league? He also has a much more raw skill-set than Laine.
Nylander had 7 points in his draft year in SHL, Pasta had 0, played zero games at the SHL, they both were nowhere near the size Pulju is.
1 offseason can have a huge difference for these guys game and how they do against men, just add Aho and Rantanen to that previous list, look at what these 4 did in their draft year and what they did the year after.
Then you should watch how Pulju developed throughout the year, he was nowhere near the player on the 2nd half he was on the 1st, in 1st he was stuggling, he was fighting with coordination issues and condifence was down, and now on the 2nd half he was one of Karpats biggest offensive threats, and has played few games on the 1st line in the playoffs against the best Liiga can offer, Aho and Pulju have been the guys that Tappara keeps an eye on, you can see in games how they try to block them in the offensive zone.
Karpat is a deep team, Pulju averaged just 15mins per game on regular season, it's not just that easy to look at stats blindy.
Same goes for Laine, he's developed throughout the year and if healthy I'm expecting big improvements in the offseason and him being able to rock the NA ice.