Well, to break it down even further...
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Robotic upgrades, like Vader?
Upgrades? Or being kept alive through neccessity? And surely in a galaxy where technology means
people can have cybernetic parts fitted, then... anyone might have had cybernetic parts fitted. I don't get why that fact alone would narrow it down to Palpatine. Surely "robotic upgrades, like Vader" narrows it down to potentially everyone we have seen previously in a Star Wars movie, and everyone we have not yet seen?
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Red lightsaber?
What - Maul is back? Dooku is back? Vader himself is back? Or
a new character has a red lightsaber?
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Fascination with Vader?
Again, 2+2=5. Just because Palpatine showed interest in Anakin and his potential, doesn't mean he was "fascinated" by him in a general and continuous sense. He just wanted the best apprentice available. Was he not offering Luke the same job, dropping Vader like hot bricks, on the second Death Star there?
It's just all a step too far - dubious speculation based upon dubious speculation...