Skillset. If one watches Crouse actually *play* and sees a comparison to Malhotra as a junior, then I don't know what to say. And that's my issue with the stat watchers. You're coming up with comparables based on STATS, not based on whether or not the two players being compared actually have similar skills or tools.
Your method is as flawed as looking at Corey Locke's stats when he put up 151 points and saying "the closest comparison I can find is Sidney Crosby's 168 points", and then drawing the conclusion that that means that's what you should have expected from Locke at the NHL level, then wonder why he didn't produce like Crosby in the NHL. Anyone who actually WATCHED Locke, and not just looked up his stat line, would have seen he wasn't going to be a star NHLer like Crosby, despite their similarity in points in junior.
(By the way, if we're sticking to the stats argument, I'm willing to bet that by the time Crouse is 19 years old, in his 4th junior season, he'll be well above a point per game.)