If Naruto really was just some random baby that the 4th used to seal the jutsu in, wouldn't he have some family or family friends? It would be pretty improbable that Naruto has ABSOLUTELY NO FAMILY whatsoever. But thats exactly what seems to be, Naruto is utterly alone, and does not seem to have a single blood relative or family friend.

So what does that leave us? Naruto is not the reincarnation of Kyuubi, because he's obviously its container. Naruto is not the 4th's son, because otherwise the villagers would respect and have high expectations of Naruto. So could he be the reincarnation of the 4th? It isn't as far fetched as it seems.

For one, when we saw the 3rd use the 4th's sealing techinque on the first and second undead hokages. You see that the death god's hand come out of the 3rd's stomach. That hand then grabs the target soul and stores that soul in the 3rd's stomach forming a seal.

What does Naruto have on his stomach?? The exact same seal. It could be that the 4th tried to kill Kyuubi with that techinque, but because Kyuubi is immortal, all he could do was contain Kyuubi in himself and regressed himself into an infant.

My theory is that only Jiraya and the 3rd knows that Naruto is the incarnation of the 4th. That would explain why Jiraya took up Naruto as his student so quickly, especially with Naruto's poor reputation at the time. Maybe thats also why the 3rd tried so desperately to keep Orochimaru from raising the 4th Hokage from the grave. Maybe if the 3rd actually was successful in raising the 4th's grave, it would have killed Naruto and released Kyuubi?

Of course the other side of the argument is that the 3rd just knew that he couldn't compete against the 4th's sealing technique.


Anyway, it would make a good plot twist. If it does happen in the future, it would probably happen in the end of the series.