Board Thread:Theories and Speculation/@comment-25302335-20150914182027/@comment-5407586-20150915184640

Nano555 wrote:
 * 1) My question is why he became the jinchiriki of the ten tails (chronological order, what really happened,in the first versions of this story Hamura was not cited )
 * 2) how Hashirama learn senjutsu and recognized the rinne tensei as rikudou's kenjutsu
 * 3) how are the powers of Madara's Mangekyō Sharingan
 * 4) why Kishimoto gave a new arm to Naruto and not for Sasuke
 * 5) the power given by Hagoromo is temporary or permanent?
 * 1) In the first version told by Tobi at the Kage Summit, Hagoromo became the Ten-Tails' jinchūriki in order to stop its rampage, and sealed the body in the Moon after ripping its chakra to create the nine tailed beasts. Hagoromo said that he and his brother fought the Ten-Tails and defeated it by sealing it inside him. Black Zetsu recorded that the two brothers sealed away the Ten-Tails in the Six Paths — Chibaku Tensei, creating the Moon. This of course causes confusion, because that means the Moon was created way before Hagoromo's death: however, according to Yin-Kurama, the Gedo Mazō was what kept Hagoromo alive after creating the nine tailed beasts. As such, we don't know how exactly the events unfolded. One way to explain this mess would be: brothers seal away the Ten-Tails in the Moon; Hamura and the Ōtsutsuki clan go there to guard the monster's body; Hagoromo decides he needs the beast's power for spreading Ninshū, so he summons and seals it inside himself; at the end of his natural life, he splits the body and chakra, creating the nine tailed beasts from the latter; he then de-summons the body, resealing it in the Moon.
 * 2) We don't know how and where Hashirama learned senjutsu. One chance could be at Shikkotsu Forest, under Katsuyu, seeing how that place is labeled as one of the three sage regions. Him recognizing the Rinne Tensei may be due to legends about the Sage of Six Paths' power.
 * 3) We don't know the powers of each of Madara's Mangekyō Sharingan.
 * 4) Sasuke may have decided not to get a new arm out of desire for atonement.
 * 5) It seems permanent so far. Sasuke's Rinnegan is still there, same goes for Naruto's Six Paths Sage Mode.