The biggest plot hole still remains..

[Kurama2012]

one problem with your post, orochimaru and tsunade never got to see the rinnegan nagato revealed it when protecting yahiko after jman already agreed to look after them

also the uchiha stone tablet only talks about the secrets behind the eyes. the rinnegan is a dojutsu of legend which most shinobi older enought knew about but only see it as nothing more than legend

 

[0moi]

Jiraiya was looking after the Ame Orphans before Orochimaru or Tsunade left Konoha, the day that the Sannin first encountered them Jiraiya began to look after them. He was watching after them simply out of sympathy at first, just until they could defend themselves....