No proof. Look at my earlier post.
...Are you purposely trying to be oblivious?
The
title of the chapter is
Minato's Shiki Fuujin. Now why would the author make the title that, and make one of his revered characters make the statement that said jutsu belong to the same character mentioned in the title, whilst we've seen no one else use it, if the jutsu wasn't his?
When Minato uses the Shiki Fuujin on Kyuubi, Hiruzen doesn't see him using the jutsu, he sees the demon itself. Hiruzen automatically assumes that it is
Minato using the jutsu and not anyone else, what does that tell you? Why didn't he assume it was Kushina? Because it is not her jutsu, it is Minato's.
Then I followed up with an example. Prior to Sasuke using the Chidori, we never
knew for certainty that Kakashi invented Chidori. Hiruzen makes the statement, that that was Kakashi's jutsu, and at that point we accepted that Kakashi was the creator of said jutsu. It is no different than Minato's case.
You ask for proof and yet, you
have no
proof supporting your thesis that it
isn't Minato's jutsu... I really don't understand people's piss poor logic here.