Sales are not direct math especially during holidays in 2011 360 was 1.5 million behind PS3 on yearly sales the holidays almost made that hole gap fade away. Xbone 10 million due to pricecut before black Friday. PS4 17.5 million due to the lack of a killer exclusive or a real Mcc counter. U 10.5 million due to smash 11 if smash bundle will be announced for black Friday and Christmas.
Please excuse my (probally) poor grammar