Palpatine wanted Rey to kill him so he can hop into Rey. So, Rey did. So, why didn't Palpatine hop into her body? Does it matter how he died? He died again. But his spirit could have still hop into Rey or other people. That was his plan. Rey didn't sacrifice Palpatine the way he wanted her to, but does that matter? What matters is that she killed him. That is what Palpatine wanted. So, what is the problem? Did Rey create a force vacuum to keep his spirit from escaping destruction as things blew up?