AHL isnt clearly better place than Liiga to develop in. Doesn't really matter that much, unless the reason why you dont make it in the NHL is rink size or straight forward hockey. We've seen lesser players tear it up in the AHL, last guy was Pulkkinen. Iiro Pakarinen was 0,7ppg in AHL, 0,3 in Liiga. Pulkkinen teared the AHL. The way Pulju and Laine are playing style wise, prediction should be they should be able to jump right in the NHL. So cross the big sea when you are ready enough. It's not like you're taking clear leap forward if you become AHLer.
Pulju is already 0,5ppg in Liiga as 17, for example Pakarinen was 0,3ppg @ 22, and Pulju is getting better month by month. Pulju is of course whole different level. Laine is 0,8ppg already, and also getting better. Barkov ended up at 0,9ppg draft season, went 2nd overall. These boys got better shooting than Barkov. No I wouldn't be that surprised even if he and Laine made the cut to NHL roster next year. At that age, they're taking big steps in few months and one summer. Barkov made it with his great 2way game, these guys will make in the draft with scoring ceiling.