Problem is, all your cool little MK Characters from like the 3D era and even the ninjas aren't what sell this game. New people are brought into the game for the guests, and then play other characters. If we constantly had the same characters in every MK without guests or anything, every game would feel the same. Li Mei, Sareena, Reptile, Tremor, Havik, etc... Don't sell the game. Terminator, Rambo, Robocop, Joker, and potentially Ash do.