OK, so, remember how Rabukan is a maybe-Stalker, yet she showed up to mourn Krum's death (which she didn't cause, if she was a Stalker, probably)? Remember that Garbador who showed up weeping over it? (I'm actually mildly assured she's Philter, as she thinks of herself as ugly, which matches the Philter case.)

I'm starting to think-and this is kind of weird-I'm starting to think that the Enthrallers/Stalkers do not routinely communicate, and that those who are resisting the most are the ones who know the most about what's going on. It's a wild theory with no real proof to back it up but it's a possibility.