Gashu says, as his final hint "Have you ever questioned your upbringing?" or something like that. SO, all of the candidates are probably adopted. We know that so far, Kanna, Sara and Q-Taro are all adopted. It's not unlikely that every other candidate is too. And, they probably all have something to do with the orphanage Asu-Naro, which is where Q-Taro is from. Kai mentioned it during the laptop scene in chapter 2. So uh, yeah. Thought?