Pre-WJC18, Hemming was dropping from early 20s to the late 20s/2nd round conversation. In two games, Hemming is 3+1 and a +0 rating. In his second game, he scored 2g + 1, had a +0 rating, and was named Best Player for the game. His stock might be rising, but there's a huge caveat to his scoring - it's all been on the PP. Maybe his stock won't rise that much b/c his current profile is similar to last year's Haltunnen, where most of his scoring was on the PP b/c of his shot. Haltunnen was drafted in the 2nd round.
As for Helenius, he's center RW Hemming and LW Sinivuori. All of Helenius' points are also on the PP. I was hoping for more out of Helenius at ES play, but maybe his wingers aren't all that talented as ES play. I know Hemming was used as a grunt, 4th line power forward on his Liiga team and Hemming might still be playing that way as ES instead being more offensive.