None of these really address the ins and outs of Palpatine’s essence and why he’s so obsessed with possessing Rey in particular

What if Rey was partially not just a clone of Palpatine, but of the fallen celestial Abeloth?

This is an idea that I tailor made for the legends cut

But the basic gist is that Rey is a clone of Palpatine and a recovered avatar husk of Abeloth

Palpatine’s spirit is tethered to the throne, he cannot risk anything happening to it

This creates a deeply troubling state of affairs

Enter the project of Rey

He wants Rey because he can merge with abeloth through her

Merging with Abeloth will allow his spirit to possess multiple bodies at once

The death of one avatar meant nothing, he would be physically immortal

This explains the teeth of empress Palpatine

Thus the Horcrux throne and the need for Rey is perfectly explained

With rey, he can merge with Abeloth and gain her immortality

No longer needing the throne

Two scientists take her and…