Originally Posted by Konnaha_yellow_flash
The fourth got chumped by madara as he is now so I dont see him fearing someone he could chump again. RS probably isnt either because Nagatos already there so why use 2 RGs.
IMO it has to be the real madara because that would mean tobi cant claim to be someone thats clearly standing before him (soul and all). So by revealing this to the shinobi alliance. Tobi true idenity could be revealed (Juubi IMO), thus allowing the alliance to come up with a strategy to beat him.
I am under the impression that Edo Tenseii brings people back from when tehy were their strongest. this would mean RS when he was the JUUBII host AND have the original Rinnegan. From what we've heard of RS, Nagato's RG seemed like RG lite.