Everyone, the MK on MUA Content has been updated, as it is now compatible with the default 27 game, has more team bonuses, fixed team stages, and saved games will not be confused with other MUA saves -- because they are saved elsewhere.
Also, Scorpion (booster), Sub-Zero (booster), Shao Kahn, Liu Kang, and Fujin have been updated. The first three have Julio Cabral's recent updates added, but with hex-edited skins.
Don't forget that Kabal, Jade, and Nightwolf have recently been updated with better weapon models. It is best to keep the MK roster updated.