I wish they'd team up just to fight Shinnok and save Earthrealm and Outworld, instead of fighting each other, because the devil Kotal should be after is Shinnok and not Raiden.
They already did to get Shinnok's amulet from Mileena, but then the amulet seemingly managed to corrupt Kotal Kahn into keeping the amulet for himself, imprisoning the Earthrealmers, and attacking Earthrealm.