Not sure if Sid's playoff performance is clouding your judgment, but during the regular season Sid was CONSTANTLY being praised in post-game threads for his two-way play. During the regular season, this was by far and away his best two-way performance of his career. So I'd say based on that, he certainly deserved the votes.
As for the bolded part, I'm not sure what Crosby's two way play from previous seasons matters. He got votes for his performance this season, not when he was questionable defensively in his rookie season.
What does his year-to-year consistency have to do with this year's Selke voting?
I don't know how to convince you, because you're going with your eye test, but some really smart people (myself not included) both on this board and in the hockey world will tell you that he's elite.
His advanced numbers were pretty good this season too, IIRC.
AND HIS +/- IS AMAZING!
Not saying he's a BAD defensive player. I'm saying I'm not sure that I'd put him top 15 in the league. There are many great defensive forwards out there. Substract his offense and +/- (a borderline useless stat for most players and situations) and just look at his defense.
I agree his defense has improved the last season or two but that's neither here nor there. Faceoffs too at times. But look at guys like Matt Cooke for Chrissakes. Is Matt Cooke a better defensive forward than Sidney Crosby? Can you bring yourself to say it? That's sort of my point.
The league has sort of set this up like "OK we're going to call it best defensive forward but what we're really going to do is look at a dozen or so guys who get lots of points AND play sound defensive hockey, and we'll give it to one of those guys most years." The points shouldn't enter into the equation, neither should +/- except for player who aren't lined up with big point-getters, or who, like Dupuis, are potting lots of even strength goals.
Of the high end offensive guys really only Datsyuk, usually Hossa, Bergeron and a few others have truly great defensive games. As in you can count on it. I know it's not a year-to-year award, there I'm just point out the trend of how one might discern if Crosby's defensive game is "elite".
Anyway, this is about Dupuis and recognizing his skill (and defensively he's more than 8 slots better than Crosby in the real world), so I'll leave it at that.