What if the Palpatine we saw in Star Wars Episode IX: The Rise of Skywalker was not the “real” Palpatine at all?  What if he was some kind of replica without an iota of Palpatine/Sidious’s spirit whatsoever?

There is precedent for such a notion.

In Timothy Zahn’s two-part “Hand of Thrawn” novel duology from the late Nineties, the galaxy hears whispers about the return of Grand Admiral Thrawn.  Thrawn in the still-venerable expanded universe, you may recall, was killed toward the end of The Last Command.  The galaxy thought he was dead.  But he prophesied that he would return in ten years’ time if he ever was thought to have died.

Long story short, it turns out that at Thrawn’s hidden fortress (see what I did there?) in the Unknown Regions, the grand admiral had prepared a clone of himself.  It had been in stasis all that time.  Just waiting ...