Yeah, I like the “All the Sith” idea a lot, but I felt like it was tacked on and not really explored. It just seems simpler/cleaner if it is clearly just Palpatine. Especially since that’s all they call him the entire film. Just thinking out loud though.
That interpretation is interesting Jar Jar. I don’t think we could get a lot of that across just in the film, though. That there are two different types of spirit transfer or whatever.
I also wish that the whole Dyad term was used or explained earlier in the film, or a previous film.