Not really true though. Barkov made Nieminen shine for the last time. VN was barely averaging 0,5ppg in a second-rate league in Allsvenskan the year before. Then with Barkov he magically scored PPG+ and the very next year without Barkov VN scored barely 0,4ppg. Quite telling
A bit lopsided and manipulated examples. Nieminen was already for sure on a decline, so it was anyway expected that his stats would rather be getting worse year by year. And of course it was easy to guess that his production would decrease when he lost the nice chemistry and skills that he had with a teammate like Barkov.
But if you want to twist and turn stats just think of it how it went with Laine and Barkov with their last Liiga seasons and first NHL seasons. Barkov’s last Liiga season 53 games, 21+27=48 and Laine’s last Liiga season 46 games, 17+16=33. Then lets see their first NHL seasons - Barkov 54 games, 8+16=24 and Laine 73 games, 36+28=64.
So Laine scored a whopping 40 points more than Barkov in their NHL rookie seasons despite Barkov scoring just the previous season in Liiga 15 points more than Laine did in his previous season in Liiga.
Now someone could even dare to suggest that Ville Nieminen’s meaning for Barkov’s great production in Barkov’s last Liiga season was after all HUGE. And anyway definitely much bigger than some of the people here are willing to admit after all. And the clearly inflated stats that Barkov had in his last Liiga season point out also that the production difference between him and Kotkaniemi wouldn't have been most probably so big if Barkov was playing with the much weaker linemates that Kotkaniemi was playing with in his last Liiga season.
Kotkaniemi’s production (29 points) wasn't after all much worse than Laine’s (33 points), which in my opinion is very encouraging, as they both had an injury that made their last Liiga season clearly more challenging physically. So I think that Jesperi can improve a lot in the similar way as Laine did for his next season.
Oh, but there seems to be like quite a manipulation of stats earlier in my post, and we don’t want to do that here, do we? Oh, but someone just did that before me, so I just thought I would show how this can be after all turned around if people want to play that game really.