Thanks a lot for the translation! I just binged this manga and really, really liked it. I love how every character is flawed but none of them are "evil," just human. (I see hate for Yuuri in this thread and I get it, but it's already been implied her attitude is largely a reaction to her parents always prioritizing Tsumugi over her; I'm sure she'll get character development of her own.)
As for predictions, I agree with the comment above that Mei will probably end up eliminated. I think Aria noticed her lack of cohesion and unity with the rest of the group. Also, she's only 14 so even if she drops out early she'll still have plenty of time to debut as an idol through other routes.