Naruto's the most powerful from ch570.

[Lord Snow]

He is not the strongest, but now that he is working with the kyubi, he is much more powerful.

 

[USSJ Future Trunks]

really? what could he do vs nagato's preta path and chibaku tensei? once narutos trapped in that, nagato can just summon gedo mazo and soul rip. gg. and then theres tobi madara and kabuto.

 

[KAGE RYUU]

i luv naruto but if he was the strongest person alive he would destroy tobi without any help

 

[sravan]

Naruto will rape madara,tobi and sasuke all together at once

 

[Namar]

Sasuke is way behind Naruto now

 

[narutownsyouall]

sasuke is about to show us whats up i wouldnt doubt that EMS will somehow be able to fight naruto in BM. and naruto would own madara but i dont know about Tobi

but i wouldnt say he is the strongest

 

[Uchiha Heikou]

The only living shinobi I think might rival him would be Tobi, Sasuke or Kabuto. Edo Madara is dead. Tobi is clearly super powerful as is Kabuto. Sasuke's current power hasn't been shown yet so he's a mystery.

 

[Ryuu..]

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[USSJ Future Trunks]

tobi and kabuto are stronger. possibly hiruzen prime.