Board Thread:Theories and Speculation/@comment-45173656-20200306105314/@comment-25122992-20200308182536

The problem is, there are different versions of the events. What @Squinty97 mentioned is one of them, if we go by the version told by Madara, Obito and Kurama. According to another one, mentioned by Hagoromo and Black Zetsu, Ootsutsuki brothers sealed the Demonic Statue, the husk of Ten-Tails, into Chibaku Tensei while sealing its chakra into Hagoromo. In other words, it means that Hagoromo created the tailed beasts purely out of Ten-Tails' chakra within himself.