Crosby was pacing for 97 points that year, while McDavid landed on 100 – so saying that he "most likely would have won or been within a point or two" isn't exactly offbase. But Crosby let his foot off the gas toward the end of that year, in advance of yet another Cup run, while McDavid went trophy-hunting (to his own admission) in the last month of the season. You don't think a Crosby who was pacing at nearly the same clip might have gunned for a few more points, if the race were tighter (and with the goal tie-breaker)?
The point is, Crosby was an Art Ross contender beyond 2015. The notion that the monolithic Canadian media collectively joined forces to prop up Crosby's defensive play, because he couldn't compete offensively, is just a wild projection. Besides, no one thought that Kane was better than Crosby, outside of a few people who don't know the difference between the better season and the better player (or that Kane is one of the league's most irresponsible defensive players). No one needed to pump Sid's tires.