Board Thread:Naruto Discussions/@comment-32685487-20180610182908/@comment-734582-20180612074651

Natrix Spiritual Cloak Gleam wrote: Rinnegan cannot be wielded by even a Uchiha plus Senju Container like Obito. So it's not just the above two clans in work here. Obito also had a curse mark on him, which may have prevented him from dual wielding the eyes. Plus, Nagato got both of them as a child in an apparently inactive state (Madara placed some sort of seal on them?). We've seen before that kids also seem more malleable when it comes to foreign powers (e.g. Yamato, Naruto).

Could be any of that, could be none of that. But i find it suspect that a kid wields Rinnegan better than an adult from the proper clan and with actual transmigrant DNA, so clearly more is at work here. Since Madara transplanted the eyes to Nagato, it seems obvious he did something.