When exactly did Izuna implant the eyes into Nagato? It had to have been when he was just a kid: so how did he predict the extent of Nagatos potential to learn to control them as well as he did?
Also whose eyes was Izuna using between transplanting them into Nagato and Nagatos death?
what makes this even more legit is when Tobi questions nagato after his death, he told him he was supposed to not use the reviving jutsu just yet and he wasted it on the people of Konoha. im guessing it was to fully revive madara