FF7 Remake is a good example of how little these creators think things through, you have this guy that was already supposed to be strongest, even more powerfull and then he is being confronted by the party even on earlier parts of the game and losing? He could also just have killed everyone already, at no point we are show that there anything preventing him from doing that, especially if he can force the outcome of another timeline into another, he could just force the dead part on others as well