"Most Hopi accounts of creation center around Tawa,.... Tawa is the Creator, and it was he who formed the First World out of Tokpella, or Endless Space, as well as its original inhabitants.".....
Very close anyway, to common, world wide, creation myths in accordance with the "terraforming" theory.
The Earth was an "empty" place, where we was rooted. It is really the only logic here.
So the Apkallu was delegates to restore civilization after a revision.