Kucherov-leader in goals, Kuznetsov- leader in points. But frankly speaking I think that for Kuzya this WJC might be not as impressive as it was last year cause he has nothing to prove. If Grigs is on the team and plays with Kucherov I expect Kucherov to be leader both in goals and points and even maybe the tournament's MVP.
Kuznetsov has to prove that last year was not just some puck-luck with lucky bounces and that Russia is indeed the best, undisputed, U20 team in the world. Ofcourse, they deserve the win last year, but in sports winning again is what really sets the best apart.
There are game winners, and there are legendary winners (Red Wings, CSKA Moscow - until now, Montreal, Manchester Utd. and so on).