if indeed nagato will give him power, naruo will become unstopable, kyuubi+4th+itachi+nagato= naruto's mind and body? who else is giving him more power?
Doubt Kishimoto, after designing Naruto as a hardworking ninja who never gave up, would make him look like a sweet-talking douchebag running around talking his way to other peoples powers lol. But, hey.. you never know.
Anyways, I doubt he'll help by concretely assisting naruto, rather do something that will help him on the road to peace, something involving bijou, the statue, akatsuki, whatever.