it would be the only way sasuke would be able to unluck rinnegan, and would explain both brother's incredible natural abilities as far as sharingan goes. think about it... its not impossible, and i think kishi showed that here:
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it clearly shows them being close friends...maybe family members?
One was brought for the purpose of being the next jinjuuriki
the other was brought to mate with a Uchiha....resulting in itachi and sasuke
im just saying its not impossible....kishi would do something like this....
what do u guys think?