Board Thread:Theories and Speculation/@comment-36300243-20180723092044/@comment-6036561-20180723120918

For starters... the meaning of the your Kabuto cant reach Jiraiya corp at the bottom of the sea point is that Jiraiya had already been resurrected by Kara during the Fourth War, right?

Put that aside, you explained how Kashin Koji could be Jiraiya - and the reasoning in itself is solid - but not why he must be Jiraiya. And in that regard let me tell why, imho, Kashin Koji must not be Jiraiya.

 The whole "let's bring back a dead character" usually is (again, imho) too much fanservice-ish. They already did it with Ao, and the result was dumb and unnecessary (they could have used a random Mist ninja instead of Ao, the result would not have changed) If as you say Kashin Koji is Jiraiya and he is still good, and "undercover" in Kara... it would be really, really lazy from the storyteller. He would have basically copied the character of Itachi Again, if KK is J and he is still good, it would have been really really dumb for Kara to resurrect him and give him so much freedom. Itachi had his "backstory" to earn the trust of Akatsuki, with the all Uchiha massacre and all. Jiraiya had NO reason to turn evil, and Kara should know that... so why resurrect someone who clearly has no reason to be you ally, but all the reasons to be your enemy, and have him as one of the top member of your organization? In instead Jiraiya turned evil, there would be two options. First, he turned evil himself... but why? Naruto fulfilled the profecy, Jiraiya should be satisfied and have no reason to turn evil. Second, after being resurrected he was also modified to turn evil, and that would be (again XD ) a really really dumb plot twist 

Also, I don't see so much similarities between Jiraiya and Kashin Koji, not on a graphic standpoint (elve talked about KK's face, but also his build is different, much thinner than Jiraiya) nor in their fighting styles.

tl;dr: Kashin Koji could be Jiraiya, but we have no evidence to point that he surely is Jiraiya. Also, I think it would be a lazy and dumb plot twist if he was