Rikudou Senjutsu is the highest form of senjutsu. Two requirements are needed to awaken this power, All nine bijuu chakras and rikudou chakra.
By becoming juubi jinchuriki one automatically gains Rikudou Senjutsu(Kaguya,Hagoromo,Madara and Obito) as this meets both requirements. However similar to uchiha and rinnegan, only senju/uzumaki whom mastered sage mode and possess all bijuu chakras and Rikudou Chakra can awaken RSM.
The databook list only two people as Rikudou Sage Mode users which are Ashura Otsutsuki and Naruto Uzumaki.
Naruto already a perfect sage, throughout the war received all the bijuu chakras. However Naruto didn't awaken RSM until he was blessed with Rikudou Chakra.
People are confused as to how ashura awakened said power without being a jinchuriki. The answer is simple, Ashura inherited his fathers body/yang energy.
The bijuu fall under the yang category, the are literally physical massess of chakra. Ashura inherited his fathers yang chakra, in short ashura inherited juubi chakra naturally.
Also Ashura is Hagoromo's biological son, it goes without saying he possess Rikudou Chakra.
Ashura is essentially a juubi jinchuriki without being an actual host, just like Naruto.
By becoming juubi jinchuriki one automatically gains Rikudou Senjutsu(Kaguya,Hagoromo,Madara and Obito) as this meets both requirements. However similar to uchiha and rinnegan, only senju/uzumaki whom mastered sage mode and possess all bijuu chakras and Rikudou Chakra can awaken RSM.
The databook list only two people as Rikudou Sage Mode users which are Ashura Otsutsuki and Naruto Uzumaki.
Naruto already a perfect sage, throughout the war received all the bijuu chakras. However Naruto didn't awaken RSM until he was blessed with Rikudou Chakra.
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People are confused as to how ashura awakened said power without being a jinchuriki. The answer is simple, Ashura inherited his fathers body/yang energy.
The bijuu fall under the yang category, the are literally physical massess of chakra. Ashura inherited his fathers yang chakra, in short ashura inherited juubi chakra naturally.
Also Ashura is Hagoromo's biological son, it goes without saying he possess Rikudou Chakra.
You must be registered for see images
Ashura is essentially a juubi jinchuriki without being an actual host, just like Naruto.

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