After Naruto defeated the Kyuubi and took its chakra, kurama confessed that he looked exactly like the SO6P. The SO6P was seen as a figure with a necklace of 6 rings which look like the tomoes of the sharingan. This feature also appeared in Naruto after he took the Kyuubi's power (Anime episode 247). I think the SO6P left something that Kurama may not have known........................................
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