The rankings seem based on the years they had leading into this coming season. They are ranking Dahlin lower because their assumption is that is impact, being a defenseman will take longer and Pettersson and Shvechnikov. Does anyone really know though? I mean, c'man. Clickbait.
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Yet still, defenders generally take a bit longer to get adjusted to the NHL, and in the last 55 years, only three teenage defensemen — Denis Potvin, Ray Bourque and Aaron Ekblad — won the Calder Trophy in their first post-draft season. That’s not to say Dahlin won’t contribute and likely out-produce most rookie rearguards. The chances are greater, however, that any of the aforementioned forwards will end up exceeding expectations and produce a Calder-winning season.