We had fan theories that is was Darth Jar Jar behind the whole thing, being the puppet master to Palpaltine.
So while the “Fall of Skywalker” film was the redemption of the Palpaltine family line (until ep.X reveals Rey is a Sith after all – having used the powers of the light side/Jedi to remove ALL others – “because there can only be one”).
So I can see them, after Vader was redeemed, that Sidious will be too (the redemption of the evil empire of KK and the house of mouse).