From where should start? Oh yeah...
- Hagoromo's tatoo is his MS and awakens it together with Rinnegan when Hamura is in the verge of Death
- Hagoromo has PS which exactly like Madara's only that it has a beard and it's light blue...
- Kaguya and the Ten Tails are not the same entity. The Divine Tree turns into the Ten Tails (It has Six Tomoe Rinne Sharingan and it more like its second form at first...) which protects Kaguya. She and her sons battle for months...
- Six Paths Chibaku Tensei seals Kaguya who is weakened.. Kaguya is sealed like how she is. She doesn't become the Mazo... More like it is hinted I believe that the Mazo is her depowered form. Before the sealing she spits BZ from her slave using her remaining chakra...
- Hagoromo splits the Ten Tails into 9 souls and nothing is said about the Mazo! BZ implies that Hagoromo died... And he was not a Jin of Ten Tails.
- It also seems that Hagoromo was never a Jin. He just has the Beasts and taught them to love humans.. Or rather he was the Jin of the baby Bijuu? It gets complicated..
- Hamura when controlled by Kaguya said he felt his Mother fear and we went to the Moon so as to be near her... He loved his Mother..