what i mentioned to say in this theory is naruto may become an rinnegan user in future..
and jyubi is a secondary thought ..
i hope he is great with kyubi itself..
just referred to the eyes of sasuke and naruto... dark and light coloured ..yin and yang
my idea is just that....
when yin and yang combines in a balanced way it symbolizes peace.
thus the story may end only with peace when sasuke and naruto join together..
this is just another thought to it after looking at the above image