They fought Kaguya after Indra and Ashura was born, how else would she know them
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nope she cam to the realization by looking at their chakraBZ either told Kaguya about the main battles or showed recordings of everything important to her.
Actually, that has nothing to do with the recent filler, because this mislead has existed since the manga chapter came out.
this?I want to know who was the 3rd guy with Kinshiki and Momoshiki