User blog comment:Berserkchart486/Chakra Levels!/@comment-25152698-20151006111929/@comment-25152698-20151006135358

Also, Prince; "Transmigration has nothing to do with chakra levels?"

Part of his chakra prowess and physical energy stems from being a reincarnation of his ancestor, Asura.[34]

This literally says, "some of Naruto's power comes from being a transmigrant".