MegaManX on 14 November 2015
Splatoon had a 5 month head start on a console that gets little support. NPD only covered a few days of Oct. and UK isn't the whole world. There's also people waiting till black friday sales since the game was released less than a month before BF, MS will sell a ton of consoles and games over the next month. When Splatoon got released in May of course people who's Wii U was gathering dust would want something new to play.
Besides unless you want to resell your games, there is no reason to buy retail on XB because it uses the HD regardless of whether or not you have a disc or digital so I'm sure more people this gen just buy digital for games they want long term like Halo 5.
Splatoon will not outsell Halo 5 lifetime.
