So apparently it was planned to have the Arbiter from Halo series or the general RAAM from gears of war as Xbox 360 exclusive character just like they did with Kratos from
Mortal Kombat 9 Online on Xbox 360 (FB Highlights) - YouTube
Mortal Kombat 11 Ultimate Edition Xbox Series X, Xbox One 12345 - Best Buy
Play Mortal Kombat 11 | Xbox Cloud Gaming (Beta) on Xbox.com
Mortal Kombat 11 Ultimate announced for PS5, Xbox Series, PS4, Xbox One, Switch, PC, and Stadia alongside 'Kombat Pack 2' - Gematsu
Xbox 360 Longplay [105] Mortal Kombat (2011) (part 1 of 5) - YouTube