That might be true if you are talking about Edo Nagato (who was just part of Kabutos power), but Naruto > alive Nagato from manga.
BTW. Why is Itachi so high?
yeah, why is it that itachi is in the 3rd spot?well maybe because he's strong and genius as fvck. maybe it's because he countered kabuto's edo tensei with his genjutsu. maybe because he pawned DSM kabuto with izanami and break his edo tensei. maybe because sasuke never defeated him. or could be that he pawned orochimaru's lame as$, he also pawned edo nagato using susano with the totsuka. maybe also it's because of his mastery of the MS-amaterasu,susano with totsuka and yata, tsukoyumi(pawned deidara), izanagi(possibly),izanami, etc etc etc.*