I believe cabra is wrong about the kochal. There is nothing I have found more difficult in the game then those three fights, and the computer does learn. Perhaps you are less skilled then myself, for 2 of the 3 battles were challenging and t he one vs kira was super annoying. Kabal is a push over, just make sure to block or in a middle of a combo while fighting him. Vs cobra, you have to do it flawlessly or near flawless, patience wins this fight. For Kira: Kobra is the f u c k i n g man. Spent 2 hours with Lui kang, mileena, kenshi all defensive or low dmg characters. Kobra is t he easiest to fight her with, and you have to rush and do high dmg.
And another thing about this "kochal" it opens a portal. You have these secret keys. There are more "secrets" in this game then we realize, and I'm sure there is more to this kochal than we realize. Why would this portal take you back to the starting portal. I say be weary, but don't get your hopes high.