Your literally trying to underrate Nagato, are you f**cking serious? He was called the 3rd SO6P by Tobi himself. Edo Nagato wasnt healthy, he was less then his prime. Naruto and Bee were losing before Itachi came in. If Itachi didnt tell them to shoot the black orb, bee and naruto would be dead already.
I cant even bother arguing with you that Naruto beat Nagato in SM. He was fighting the Six Paths of Pain not Nagato.
The Deva Path destroyed the entire village in one jutsu. This was being controlled by an Unhealthy Nagato, Also through the Six paths. Edo Nagatos power was 10x that of the six paths put together. A healthy Nagato would be atleast 50x that power. Stop underrating him, he is one of the most powerful characters in the entire naruto series. The only people that could possibly beat him now is Bijuu Mode Naruto and Tobi with his Six paths...... Just stop -.-
Also Edo Madara would have a slight chance. Only with extremely high difficulty though.