By who though, Pittsburgh media? I really haven't heard anything this year. Crosby is a good possession player, but he really has no business in Selke talks, and I wonder how much of any discussion is simply name value and/or a narrative to explain his point totals being down.
Besides, this is about '14 Crosby anyway. Before any top 10 Selke finishes or his '16 playoff run where he was praised for his defense. '14 Crosby is a little better in his own zone compared to McDavid, mainly due to experience and ability to work the boards down low, but McDavid last year was better in the neutral zone, at striping pucks and putting pressure on the puck carrier. The defensive advantage isn't large, and since McDavid was a far better 5v5 scorer anyway, that defense still doesn't make him a better 5v5 player (the only place Crosby's defense matters).