Focusing on the offence, since obviously there is no arguing defensively, this just doesn't paint as full a picture as you want to suggest. Stone had a phenomenal year offensively this season, where he played 60 games, at age 26 with a sample size of 3 previous NHL seasons producing at a 60ish point rate. Gaudreau produced over a point per game as well, only he did it over the course of a full season, for the second time in the last three seasons. The sample size you are using focuses in on Stone's best season while including Gaudreau's dip(61 points in 72 games, so pretty standard for Mark Stone) sandwiched between 160 games of point per game production.
Stone is generally underrated and if he maintains his production from the last season then he deserves to be considered one of the very best wingers in the league. I highly doubt you even believe that they're pretty much a wash offensively, although did a quick look at your post history to confirm you were also the guy who thought he was better than Benn so...I guess you probably do? 60 games of point per game plus production that diverts from a consistent three year track record is not enough, if he does it this season feel free to bump this thread and every other winger ranking thread and argue to your heart's content.