Board Thread:Naruto Discussions/@comment-36221354-20180717114536/@comment-6769189-20180718152842

FlatZone wrote: the wound opening leads to his heart, he literally got stabbed through the heart. the healing process would go all the way to the heart to heal the heart too. The healing effects the entire body, regardless of where the Hashi cells are grafted. The manga was pretty clear that his transplant wasnt more superficial than deep. Unless its stated to be on his, then its not on his heart.

Georgio722 wrote: I believe that you do need the Sharingan... I think the eye that can awaken the sharingan is needed, mostly because the Sharingan and Rinnegan were once one, and as generations passed, it became more and more watered down.

There is also the fact that it has a different power set and doesnt modify or enhance Sharingan abilities, and actually needs to be turned off to use MS specific abilities.

Basically, an eye that holds the Sharingan also holds the Rinnegan.