I dont knwo hwo it could be missed. there are ALOT of signs. plus i got a crazier idea, that not only is he Narutos father, but he also survived and hes the leader of Akatsuki. i got this idea few months ago an djust left it alone as im kinda oot of Naruto though im drifting back into it. plus if whut i said is correct, it would actually make one of the recurring arguments more vallid, even if Ororochimaru meant that Naruto was The fourths son, how would he have known? Becaus eh ewas once a member of Akatsuki, and just cause they both happened to come from Leaf village, he shared a little, snippet of fact.
See I can't picture the 4th leader of Akatsuki. How can you survive something like what he and the 3rd did? It wouldn't make any sense at all to do that. Madara Uchiha I can see because he might not have been at the Leaf Village when Itachi killed everybody. And Itachi already said another person besides him had the Mangekyou Sharigan before Kakashi ever had it.
Nah Madara hasn't been seen just mentioned by Kyuubi. And it never explains what Itachi meant by if Sasuke gets the mangekyou then he'll be the third or something like that. Though I'm not sure if that was the manga or anime that said it.
So I'm thinking Madara is the other one. And he's stronger then Itachi, and now I'm just guessing he might be the Akatsuki leader.
the akatsuki leader had dark dots on the lower half of his face like shino, so maybe {if theyr not just makeup} hes a bug user. and also, the "leader" might not be the real leader after all. remember that unknown akatsuki guy who has still sinisterly only been seen in the shadows. nothing is known of him yet he is of a similar physique, height, and most of all, hairstyle as yondaime.
It was revealed like two weeks ago, strange how they just came out with after all this time when it was like they were scared to even hint at it before. Although I guess it would kind of spoil the plot of it was known during Naruto but its just strange how Jirayia and Tsunade were just chatting away about it when its never once even been hinted at except when Kakashi notices a similarity and when Jiryia says he reminds of the 4th, that's it, its fuking weird.