[Predictions] small prediction

[~Hasashi~]

we see the juubi has rienngan (spelling) plus some kinda sharingan (a bunch of tomo's) so this is my theory

what if when the sage fought the juubi he didn't have the rienngan and by sealing it in himself he got it but it wasn't the same as the juubi's

and his son (who's descendant's were uchiha) got the sharringan part of the juubi

(if u ask why didn't the sage get the complete rienngan of the juubi maybe madara still hasn't found out the story maybe his son was already born and he couldn't contain the whole rienngan so he sealed the sharringan part in his son)

[Valkyria]

It's up in the air but that would mean Sennin Rikudou went up against the Juubi w/o the aid of a dojutsu. It'd have been like Minato vs Kyuubi v2 on crack since the Juubi dwarfs the Kyuubi in power and Sennin Rikudou sealed the strongest entity within himself without sacrificing himself to the death god. Though how did he develop jutsu's? I'll have to read it properly again but wasn't it suggested that the Rinnegan was the tool that helped him develop jutsu's? It's pretty certain that he was a genius like Minato and Itachi but if he developed jutsu's and learned about chakra through initiative that is really something. He did develop the sealing method.

[Magellan]

I have prediction, the younger brother doesn't have the sharingan/rinnegan but still he has genes so there will be a time in his generation can activate a power that is similar to sharingan or rinnegan or both. I think Naruto has the tools to do this and he needs more teachings to come up with an awesome forbidden jutsu.