Okay, I was reading F&P again, and I really think that the scene where Sang shows Derrick the secret attic room is more than just a throw away scene. I think it will end up being really important. Especially with how Sang didn't tell the guys.
I'm getting more convinced that he is Volto. He knows a bit more about the Academy than normal people but doesn't really approve of it, he has easy access to Sang's house through Marie (and what if that is why he's acting into her?), he knows the boys well, and it would be easy for him to watch over them all and understand their comings and goings. It would have been very easy for him to get his hands on Sang's phone. He may have realized how all the boys liked her upon seeing the attic and thought that it was wrong. When he was sleeping in her room he really could have been scoping it out and realizing that there were cameras he could tap into. And what if when they were trying to bring him into the team, Derrick was put on the visitors list to Victor's house and never removed. Hence, how it was easy for Volto to access Victor's mansion to steal Sang's broken phone. Plus, Derrick seems to like Sang, and if he thought the Academy was bad it would make sense that Volto keeps trying to warn her away.
What do you guys think? Will that scene have ramifications? Is he a good Volto candidate?