I think it came around after Jiraiya died. Kishimoto had a lot more symbolism focused on Sasuke and Naruto as a pair going forward and started including the Sage of Six Paths lore into the story.
Maybe even early as end of valley first fight... Kishi already hint at connection between Naruto Saskey Hashirama Madara sana.in this fight....Saskey already acknowledged by Naruto as like brother...
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