Well I was talking about Kaprizov in the Yak and Panarin comparison, but okay for a counter point Kaprizov has 0 NHL games... He did well in the only best-on-best tournament he's been in (WC this year). The U-18/20 are nice but I don't read too much into the results from them (Pulkkinen). The Olympics were were a (Russia) best-on-the rest this year.
From the limited viewings (and youtube highlights) I've had of him I don't think he'll have the time/space needed to be the 40g/yr impact player most on here think he'll be. The KHL is the 2nd best league, but success there doesn't really equate to NHL success. most just can't make the transition for whatever reason.
Short term (1-2 years) and long term (5 years) Kunin and Greenway will have a bigger impact on the team imo.
I think there are more guys (forwards at least) who have made the KHL-NHL transition successfully than haven't.
Kuznetzov, Radulov, Panarin, Malkin, Ovechkin, Tarasenko are all obvious but consider
Evgeny Dadonov:
2016-17 (KHL): 53 GP, 66 points
2017-18 (NHL): 74 GP, 65 points
Nikita Soshnikov:
2014-15 (KHL): 57 GP, 32 points
2015-16 (NHL): 11 GP, 5 points (mostly AHL, but pretty good there)
Slava Fetisov
1988-89 (Soviet League): 23 GP, 18 points
1989-90 (NHL): 72 GP, 42 points
Can't think of many for whom it hasn't worked, except for Shipachyov, who was 30 and didn't like his role (to say nothing of having to move from St. Petersburg to Vegas, good lord) Pretty sure he would have produced just fine if he had stayed.
Just because the guys who lead the KHL are less-than-successful NHLers for the most part doesn't entail the reverse: that guys who are KHL stars won't be good in the NHL. I will agree that 40 goals is asking way too much, but Kaprizov should be able to put up 50 points. And I think that's a distant bell for Kunin and not likely for Greenway anytime soon.