Board Thread:Theories and Speculation/@comment-25319479-20180502154141/@comment-4080775-20180502154658

I've heard people say it is Jiraiya and Jiraiya as an Edo Tensei, but Jiraiya was clearly in no condition to move, let alone swim from such great depths, and all Edo Tensei's have black sclera, so it can't be Jiraiya as far as we can logically tell.

I personally think it is someone Jiraiya has trained at some point.