if one of the unchosen decides to become human by being born as a human, they become one of the Chosen ones.
the chosen ones, having been Unchosen, are able to control the Living Stone because to do so is a function of the spirit and not of the body.
They can use certain technologies unavailable to others, such as the shape shifting features of HomeWold Aircars.
They can also cal or cast away Gaia/Leviathan because his body is partly of Living Stone because he took the shape-shifter body of Wikki before he was conceived as Isaiah