For all we know Snoke was actually leftover clone bodies of Plagueis. And according to the movie, Plagueis is Palpatine. And all the Sith stretching back to Darth Bane. So really, the Rule of Two was a ploy that allowed Darth Bane to jump from body to body for a thousand years.
Did anyone else pick that up? Basically Sidious’ spirit was just possessing his own, mangled corpse. He wanted Rey to turn and kill him because that would allow him to possess Rey. It’s the same reason the Emperor was unafraid when he negged on Luke to kill him in ROTJ.
But when Rey refused, he used her and Ben’s Force bond to siphon their life force into himself and heal his own body.
Did I understand all of that correctly?