Booker
All-Pro
Online
That could be pretty cool; Palpatine’s presence could be part of that spirit realm.I read an interesting theory that maybe Luke didn't die, but ascended and will or has acquired the powers of both Light & Dark. Apparently there are some Dark side powers that could allow Luke to do some crazy stuff from the "spirit" realm.
Revenge of the SithIt goes on to suggest Skywalker is not referring to the family name, but that of a new type of Jedi/Sith that blends the 2.
Return of the Jedi
Rise of Skywalker
?