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Wasn't there hints of him being the fourths son early on? The son of a hokage is no nobody.
Also short haired future Naruto looks so dumb. They should have kept hair the same or more like his dads.
There were hints that were implied, but Kishi wanted Naruto to stand alone back then.
Like how Jiraya thinks Naruto looks like Minato or reminds him of Minato. It was also said that the 4th wanted Naruto to be thought of a hero by sealing the 9 tails in him.
Kishi left no dead ends with this, but left himself options. It's a shame that he didn't do that for other characters like Hashirama, Tobirama, Tobi (Obito reveal was stupid as hell still to me), Madara, Kaguya (Made up on the spot I bet), Hagaromo (everything was suppose to originate with him, but was retconned to Kaguya), and Black Zetsu.