Nagato is not on the level of Hashi or Madara. Still kinda crazy that people believe this.... I think again people think of Nagato as Edo Nagato and not he real in the wheelchair.
Madara
Nagato could not take on Madara/Madara andthe 9 tails. Look at the issues the fox gave him with 8 tails. Nagato himself aid he did not exspect the 9 tails to be so powerful and fighting it sapped a huge portion of Nagato's chakra.These are faqs not just my opionion. Wouldbe very interesting If you put Nagao in Hashis place and had Madara + 9 tails fight Nagato. There would be no chance for Nagato to win.
Hashirama
Now On to Hashi. It's very hard to compare him when we have seen so little about the man. But seeing the power of Mokuton coupled with his feats: Establishing Konoha,Capturing "Multiple" tailed beast and distributing them to various nations, Becoming the 1st Hokage by defeating Madara, and when you look up Hashirama Senju it also tells you as Hokage he came across a Scroll filled with among other skills,various Kinjutsu which he sealed to keep the techs a secret.So we really don't even know what the man s capable of and he was already amazing. This is the same man who defeated Madara and the 9 tails at the same time.Nagato had issues just fighting the fox with 6 tails.Kishi also made it very clear how powerful he was through Kabuto.
Nagato
I think some of you people need to either go back and re-read the manga because you forget that the real Nagato Used the paths because summoning the Gedo Maza left him with chakra rods embedded him his back , and fighting Honzo injured his legs crippling his mobility.Pain was in a wheelchair.....He had issues fighting SM Naruto and a 6 tailed fox.People say he could have won the fight if he wanted but forget the condition that Nagato was actually in when Naruto found him.He was almost depleated of Chakra and energy.Nagato uses his life energy for his techs which leaves him in almost dead from using his ability to many times.Nagato is amazing still but there is a common misconception that Edo Nagato was the real Nagato and thats Bs. That's Fanboys wanting to make themselves and there arguments right. We also have to remember Nagato followed Tobi before Tobi was as strong as he is today.Tobi was always the True leader of the akatsuki which means was most likely the stronger.
Nagato and his 6 paths have no chance at beating Hashi or Madara(Madara Rinegan,Madara EMS, Madara EMS+9tails) but good try.
Nagato was confirmed stonger then Tobi
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Nagato healthy is a entirely legitimate version as he could of just absorbed tailed beast chakra at any time to make himself complete
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able to walk without full mobilty though
Most of Hashirama and Madaras techniques are made out of Ninjutsu which means they would have to get closer which they can not do with shinra tensei.Shinra Tensei through Nagato is strong enough to blow up a forest
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at the very least it would knock them back and even with Taijutsu Asura path Armour would make it useless
This is not including Summons,his abilty to fly and use all 5 elements to bombard them among other things