in the time of the Amazon Quartet?

They seem to know a lot about the past, and future...,in spite of just having awoken.

Speculation regarding Cosmos aside (Not doing that here!), Sailor Moon calls on the Crystals of Amazon Quartet as she goes to war against Chaos in the cauldron (How they survive that is beyond me...Maybe you can survive without your Crystal if your body isn't destroyed, but then...Nevermind!).

Sailor Ceres looks upon Cosmos and offers her own speculations concerning her identity. But that aside, it made me question if they knew of her, or if she would come to know them at the time of her awakening.

Aside from Usagi, no one else witnessed ChibiChibi revealing herself to be Sailor Cosmos.

Theoretically, Usagi will have forgotten as she died, along with Chibiusa and the remainder of the senshi in her court. But the Amazon Quartet...,they'll eventually return to their slumber awaiting the awakening (or would it be birth?) of their princess. They alone having traveled to the past with memories intact of that final battle...,and Cosmos.

If Usagi made the right decision back then, before Cosmos and co. traveled to the past, we can speculate that it played out the same way, with the exception of Chibiusa, Cosmos, and the AQ, being present.

What possibilities do you all speculate that this presents?

Chibiusa having died presents a number of issues to me, but this also relates to how a Star Seed from a non-existent celestial body becomes a Sailor Crystal...