This is the be all end all thread about the ten tailed beast known as the jyubi. First, answer the poll, do you think we'll ever see the beast again? (except in flashbacks). What do you think are its origins? What kind of a beast was it? Discuss these questions among others and discuss the eye of the jyubi.
I think the saying that the kyubi appears when enough human malice gathers really applies to the jyubi. Before Rikudou, there was extreme conventional warfare, the heavens sent the jyubi in order to destroy mankind if it deserved to be. Rikudou was given the rinnegan in order to judge if the pre-shinobi world was worthy of salvation. If he deemed it not to be, as the jyubi jinchuriki with the rinnegan, he could've easily destroyed the whole world.