well we know the sharingan branched off of the byakugan
so from this point 2 things may have happened
1. the Rinnegan users where the people who discovered ninjustsu/genjutsu. and one of their abilities is being able to see out of other bodies. so vision. it is possible that the byakugan formed from the Rinnegan because it shared the common factor of sight.
2. the Rinnegan and byakugan are not related. just because the Rinnegan users discovered ninjutsu and genjutsu doesn't mean all kekegenkai came from it.
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No Big Sigs!.... ok ok... jerk.
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