>>282016774
Well there's also the speculation that Imu is/was originally Vearth.

There's also a lot of symbolism with winged humans arriving or living above and the CDs basically wearing space suits.
It is possible that humans are not native to Earth OR have escaped Earth after some depopulation event in the first/second age and then came back once the planet recovered.
Vearth might've been some mutant mink type that started the whole demon fruit thing.

A big clue is also that the gorosei had their devil powers decribed as a "devil power" not a "devil fruit power". So Imu/Vearth/whoever it is can bestow fruit-like powers to its thralls, again suggesting some sort of originator entity rather than someone that existed within the CD/WG families framework.