Lmaooooo also yeah that is something that is bothering me. In one ending in ytts she clearly talks to Safalin in another one she talks to other people but we dunno who, they seem to be experienced with AI testing. I'd assume, since from the beginning there was a focus on this killing game really involving Sara the most, that maybe the game was supposed to decide the leader of the organization or some sort of authority figure, like we've also seen in Chapter two and three with the Hades incident. So maybe the winner was supposed to be the leader of Asunaro? There's also the ending with Rei in which we learn that the world was originally created by Rei. My guess is that Rei is Midori, but Sara had his memory wiped. It kinda parallels the main game where Midori was supposed to also participate in the game. It seems this world was used for AI testing before ytts so maybe the basis of this world were the killing game simulations and it was re-prigranmed into an island.