It's very simple.
Two extraordinary young talents.
Last season both Dahlin and Heiskanen were rookies. Dahlin being one year younger.
Generally, as good as Heiskanen was, it was agreed upon that Dahlin had a slightly better season and a likely even brighter future.
Now it's year 2 and Heiskanen has jumped way in front for the time being. Currently he is being discussed as a Norris candidate.
Pretty exciting. Let's see what Dahlin does to close the gap.
Dahlin is 7 months youger, thats not a tear in my book. But sure it does make a difference, but not as much as some posters here wish it would make.