This episode proves some things. For example It proves how obito was able throw away juubi from his body, still being jinchuriki of ten tails.
First: As Black Zetsu said she had leftovers of her power before sealing, so chibaku tensei depowered her and this is how gedo mazo was created.
Second: Based that Hagoromo and Hamura look older I can say It takes few years of Myoboku. So possibility that Indra and Ashura are already alive is quite possible and the idea of cooperation came from young ashura.
Third: Hagoromo absorbed Juubi, who was Shinju, Kaguya summon(like susanoo). Shinju had some consciousness of Kaguya, It was beeing controlled by her. Maybe by eating chakra fruit Kaguya created a link between her and god tree.
Fourth: Rikudo Chibaku Tensei seals absolutely power and that why kaguya turns into Gedo Mazo, but what is gedo mazo exactly, why kaguya turns into this after loosing her powers? Maybe those Ootsutsuki's who ate chakra fruit and lose their powers, turns into Gedo Statue thing.
Fifth: Kaguya's depowered state( Gedo Mazo) + Shinju(Juubi, that had some link with Kaguya) is the only way to bring Kaguya bsck. Look Sasuke used kabuto fleshes which contain orochimaru's chakra with anko cursed seal(Orochimaru's conciousness) and Orochimaru came back to live.
First: As Black Zetsu said she had leftovers of her power before sealing, so chibaku tensei depowered her and this is how gedo mazo was created.
Second: Based that Hagoromo and Hamura look older I can say It takes few years of Myoboku. So possibility that Indra and Ashura are already alive is quite possible and the idea of cooperation came from young ashura.
Third: Hagoromo absorbed Juubi, who was Shinju, Kaguya summon(like susanoo). Shinju had some consciousness of Kaguya, It was beeing controlled by her. Maybe by eating chakra fruit Kaguya created a link between her and god tree.
Fourth: Rikudo Chibaku Tensei seals absolutely power and that why kaguya turns into Gedo Mazo, but what is gedo mazo exactly, why kaguya turns into this after loosing her powers? Maybe those Ootsutsuki's who ate chakra fruit and lose their powers, turns into Gedo Statue thing.
Fifth: Kaguya's depowered state( Gedo Mazo) + Shinju(Juubi, that had some link with Kaguya) is the only way to bring Kaguya bsck. Look Sasuke used kabuto fleshes which contain orochimaru's chakra with anko cursed seal(Orochimaru's conciousness) and Orochimaru came back to live.