I’d argue though having R2-D2 and C-3PO within the Prequels adds a further connection between the films as they serve as the Greek chorus through all six of George’s films. They know galactic history but also have a direct connection between Luke and Leia’s history through Anakin and Padme. I’d also say there’s a deeper connection between Anakin and C-3PO. C-3PO is an extension of Anakin’s personality and experiences both symbolic and not. R2-D2 on the other hand ulimately is whose telling the story to the Keeper of the Whills. We can see little instances of where this is being foreshadowed when events are told through R2’s prospective. It’s really unfortunate how we’ll probably never see that plotline picked up on now.