What is up with everyone and their fanfics? There are no manga facts that state that hagoromo was born with sharnningan if so then it would've been mentioned. Of you were born with the eyes I'd say you awakened them too, it wouldn't have even been natural as what? After mangekou he just magically proceeds to rinnegan? If anything I think hagoromo was born with the standard rinnegan but he could make his eyes like sasuke's, you know with the Tomoe which would make sense as that style of rinnegan has the sharnningan's abilities as well. Heck hamura had the tenseigan so it isn't too far off, but the tenseigan doesn't seen to retain the byalugan's abilities though.