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Take a look at this:

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Based on Tsunade and Raikage's statements, we can infer that the jutsu Minato used to seal his and Kushina's chakra inside Naruto that enabled them to meet Naruto again was of Uzumaki origin.

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This coincides with Kushina's statement that it was she who taught Minato the sealing techniques he used (Chakra sealing, Shiki Fuujin, Altar of Sealing,etc.) which are Uzumaki Fuuinjutsu.If we work on the premise that the Uzumaki sealing techs originated from Rikudou Sennin:

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And that Rikudou Sennin himself was an Uzumaki

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Then it only stands to reason that Rikudou Sennin himself used the Chakra Sealing jutsu so that he can meet his successor: Naruto

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If we think about it, the major storytellers of obscure past events in the story were all dead people:Minato narrated the nine tails attack on Konoha

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Kushina Narrated the birth of Naruto

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The Second and Third Hokage narrated the events regarding the Uchiha oppression and the Uchiha massacre

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The First Hokage is currently narrating the Senju vs Uchiha feud and the founding of the Leaf:

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Dead people giving accurate first hand accounts of the past.After all of the above revelations, the only thing left for us readers to learn is the history of Rikudou Sennin vs Juubi and possibly the details concerning The Senju and Uchiha Ancestor.

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It is my suspicion that: Rikudou Sennin sealed a portion of his chakra inside Kurama so that he could meet his successor one day: Naruto Uzumaki, and that Rikudou will be the character who will reveal the true history behind The Juubi, The Uzumakis and the details regarding his sons: the Uchiha and Senju Ancestor.It is also possible that Rikudou also left his essence with the other Bijuus because he foresaw all of them united by one person: Naruto.

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