In the ninth Star Wars movie, when Palpatine is fighting Rey, he says: I am all the Sith.
Why did he say that? Has he done something that made him "connect" and/or obtain the power of all the Sith before him?
If not, is he saying that because he is over powered? (And yet he dies the same way as before...)
The StarWars databank article on Palpatine indicates that Palpatine is a 'vessel of all of the Sith's power'. Although this is a pretty ambiguous statement, the fact that this is then contrasted with Rey being assisted by the 'spirits of the departed Jedi' would suggest that they mean this in a literal sense (e.g. of him somehow drawing on the the power of the Sith masters who'd come before him) rather than a figurative sense of being the product of their hard work.
Rey resisted him with the help of Ben, who’d returned to the light. But their defiance gave Sidious a new opportunity – he would drain the energy of their Force dyad to restore his own body, then rule alone. Though Sidious was a vessel of all the Sith’s power, his granddaughter was assisted by the spirits of the departed Jedi. Rey turned his fell power back at him, destroying him.
