Am I the only one that finds it odd that he doesn't even consider the possibility of Ishi being the liar? Like, I know that Ishi currently has a stronger claim and I'm not stupid enough to say otherwise, but this could indicate that Ishi and Metroid are working together as mafia.
Also, there's no point in Purple and Ishi "investigating each other". Unless there actually is an insane cop or something, and I guess there is a really slim chance cause Naku (I doubt it though), because they're just going to call each other mafia.
We should probably wait for Purple to reply and then make an actual decision.