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Where the hell did you get that from?
There's only two powers that allows you to negate all jutsu, juken and Sage chakra.
And look how obvious the design is, the spirit weapons were meant to be used by Susanoo.
Furthermore DB says that it can shield the user from "god's power", Hagoromo's power is known as "god's power" and Ashura wielded it. The mirror is the perfect shield against TSB and bijuudama and the sword perfect tool to penetrate Ashura's chakra avatar.
Finally, Orochimaru only showe major interest in Otsutsuki and any artifact related to them, Itachi was known to be very knowledgable of shinobi history as well as the Uchiha history, he of all people would know where to search for the lost weapons if they originally belonged to Indra.