Board Thread:Naruto Discussions/@comment-3571355-20150819100444/@comment-734582-20150824201124

LegionZero wrote: Madara recognised Amatarasu, so someone other than Sasuke and Itachi had it at a certain point in time. Perhaps trying to copy other MS/Rinnegan techniques is just harder. Considering Itachi and Sasuke's situation, it's far more likely that multiple people can have the same Mangekyou power. As mentioned above, Izuna is a likely candidate for Amaterasu. In a similar way, it may be possible for other rinnegan users to have Limbo, yet it remains an ability restricted to that one eye, just as Mangekyou abilities are restricted to the eye that has it.