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I think Kishimoto is trying to make a contrast between Madara and Hashirama's battle, and Sasuke and Naruto's Battle at the Valley of the End.
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You know how Madara and Hashirama had that epic battle, and Madara, the Uchiha, lost to Hashirama,the Senju?
I think the contrast is that Naruto is the good guy who lost, but intead it was the Uchiha, Sasuke, winning. I think somehow Naruto, from that epic battle, unknowingly acquired some Uchiha DNA. I also think Naruto is has Senju-type DNA in him. So I think out of the blue, we will see him awaken the Rinnegan. I also have thought that Naruto in his bijuu mode is equal to the Sage of the Six Paths. Both Sasuke and Naruto will awaken it. Mark my words. U_U
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