You do know I was just talking about the summoning/animals of them right?
You're out of your mind! Hashirama Sage mode >>>> all sage modes except RSM
That makes 0 sense. Hagoromo and Hamura should have already possessed six paths senjutsu before even meeting Gamamura, that's what the Rinnegan and Magatama symbols on their backs indicate, but apparently SP think that they are just part of their fashion sense.
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Not to mention that Hamura too had six paths senjutsu when fighting the Juubi and there is no indication of him learning any toad sage mode.