Oh yeah I definitely feel it was FUG. Given that they needed him so much, they would do anything. How did they learn about his existence other than from Head-on, guard of the irregular's entrance?

Plus literally this chapter we got info that tea bastard manipulated the information about Bam's death. Him in particular. It wasn't FUG. As fair as we know he so far he is the only administrator from FUG. It all started on his floor. Who is to say that he didn't plan the trigger so that it happened precisely on his floor?

But that's that. The problem is right now. What the fuk is Rachel thinking whining about vengeance? When you hurt others you prepare to get hurt. That's the basics of climbing the tower. It's so hard to justify her mentality.