Xenoblade Chronicles X is an excellent game but Donkey Kong Country Tropical Freeze, also an excellent game, sold more copies than XCX. And Splatoon was bundled with the Wii U an DKC TF wasn't so that's more merit for Retro who sold a decent quantity of games being a non-bundled game, And the first DKC was a system seller, believe me, I was in that time when the 9 million plus sold copies of DKC saw a rising in sales for the SNES against the Genesis.