I can't decide if Princess either betrayed Allison and took Vigilant Gaze out herself and is currently up to something, and now they're booby-trapped and that's why they're being returned, or if they were successful at whatever they were to do and these "businessfolks" really are hedging their bets by trying to make nice with Allison. (I think they are naive and don't understand Allison is an Aesma-style King and she won't feel beholden to them for the favor.)
Princess conceivably has a real grudge against Allison, who not only bound them when they were an Ebon devil and changed them against their will, but also forcibly changed their gender on them. With each iteration of devil, they turn more masculine. And they were old enough a devil that if they recalled anything from their past life, they might remember how to play a long game. I like Princess, but if anyone is going to betray Allison, I think it might be her if she holds onto the grudge that Vladok might have had.
We also don't know if 2 Michael or Metatron came to chat with Vigilant Gaze while Allison was away. Or even recently, when he was forced out of his armor back to the void. Metatron is pretty insane but also an angel which as far as I can tell by the rules of this universe basically make his lies into truth. He believes his lies, which as far as I understand of the red and white arts would make them a powerful form of sorcery. So I think it's possible Vigilant Gaze could get whammied by Metatron just like White Chain was when she tore off her face.
I dunno, I just keep thinking someone in Allison's camp is going to betray her.
Nukoku might also be a possibility...her coloring still makes me think she's one of Incubus', she's very pink and white, so it seems possible she was somehow was taken advantage of by him. We've seen her single eye, but not her forehead, and she might bear part of his key.
I can't remember if I said before, I might've, but I think Allison's "demiurges" won't be demiurges despite eventually holding the keys, because instead of portraying the facet of their key in greedy excess, they do it in balance. Showcase the best of that trait rather than the worst. White Chain is the first of Allison's friends gaining keys, I suspect. If Nukoku is tied to Incubus' key already, she might later wield it not out of lust for power, but out of love for Allison, showing its softer side.
Anyway. I predict betrayals. We'll see how shitty of a seer I am eventually.
It sounds like a Disco Elysium reference