Board Thread:Mortal Kombat X/@comment-7297858-20150406181208/@comment-5561191-20150407220842

@ShadowsTwilight That's possible too. But if he's still going to help Earthrealm, I'd still consider him an ally, even if it's no longer the way Raiden wants too, and even if he would try to kill Raiden whenever they met. I don't think that's enough to make him the final boss though, or even a villain.

It's true that Liu Kang could defeat Quan Chi, Shinnok or Mileena, but these guys are not by themselves. They have entire armies with them. I don't think even Liu Kang would be a big threat in comparison to them, at least if he stands by himself.

Raiden uses his classic costume in the beginning of the campaign too, so it doesn't necessarily mean that the tarkatan battle is a flashback. Liu Kang and Kung Lao are still young in the scene, but that's probably how they were when Raiden and the others ressurected them. If their undead forms were still young, it's probable that they were still like that when they were ressurected, and their older versions are only seen 25 years later. But I'm not saying I totally doubt it's a flashback.