1.After Hagoromo divided Juubi's Chakra into 9 Bijuu's, he wanted to seal the empty body from Juubi aka.Gedō Mazō far away.LOL so many contradiction here and speculation without manga scan.
it unbelieveable "not just you the only one that can said it"
At 1. LOL I don't know how to explain because you are closed minded legacy.
At 2. Are you serious to said Hagoromo have three eye this time just for Kaguya case. But before you denied it same with Rascolev.
At 3. What is not relevant here, assumption much. You can't run legacy. The subject here is moon and the knowledge. That mean there are someone told BZ. Who they was. IF you said hago, I don't think so, why hago need to cast it if he know the effect. That mean it is Kaguya.
At 4. Yeah he never saw. But the important thing here is knowledge. Who told him about it mechanism, that mean Kaguya inform him before the sealing. The method maybe by memory restore if not mouth word.
Thanks.
This is why he used a massive Chibaku Tensei and THE MOON was born.
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Here Nagoto confirmed that his Chibaku Tensei is nothing compared to Hagoromo's wich is THE MOON !
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2.We don't have any explanation for his 3 Eye tattoo. So we both can only speculate !
3/4 It's funny that you believe cuz Kuro-Zetsu knows how someone could gain the 3 Eye, and that you can use Infinite Tsukuyomi on the moon, proves automatically that Kaguya did it also U_U
First, Kaguya got the third Eye after she has eaten the Holy Fruit ! There is no other way how she could got it !
She has nothing to do with THE MOON it didn't even exist in her lifetime, and she can't given Kuro-Zetsu all these information.
How should she know something about the MOON when it was created long after her lifetime ? Completely absurd !
Also she has nothing to do with the ''Saṃsāra Eye'' aka. Rinnengan. This is Hagoromo's business !
Kuro-Zetsu simply has gained himself the knowledge about it
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Secondly, it seems like, that you have completely forgotten that they are more way's to cast Infinite Tsukuyomi !
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Who the hell did then wrote this process down at the Uchiha-Tablet ???
Kaguya of course used Infinite Tsukuyomi but he only could use it at a small radius, cuz she didn't have THE MOON and she also didn't have any power to great an MOON !