I can also recall a text, or a post on the forum on that note, with Laura speculating about the possibility of Gurdjieff being unable to bring himself to tell about the idea of being food for something like another race.
However, since they could be using the Moon (and the apparent opposing opening as suggested by Morris K. Jessup as I understood from "The Wave", correct me if I'm wrong) in some way in the process, these could be projected at least onto the former, to diminish the appallment of the idea; take on a more abstract symbol than so direct a proposal of a predator above us in the food chain. Maybe this could enable the seeking ones to focus on The Work easier in G's time ?
It's only from our linear perspective that the idea evolved gradually, matured (or, maybe attracted more gravity?) in the collective conscious/subconsious/unconscious and got 'fine-tuned' until the present 'time' where it seems like more and more things are getting called by their true name.
The symbolism isn't any more necessary, it served as a "shield" to carry the message across the generations, until the time when collective consciousness is ready to house such information.
In these terms, it would seem to me that this forum, amongst other places, is the area where a network-based process of "chiseling" of the collective consciousness takes place. The nucleus that could be likened to the first few cells of a bamboo sprout breaking through hard surfaces. Or so I think..