I was waiting for this question honestly. When Asura used six paths sage mode he wasn’t a juubi jinchuriki, he wasn’t a jinchuriki at all. Hagoromo at the time was the juubi jinchuriki which meant he had six paths senjutsu. Hagoromo transferred the chakra to his son and boom, he enters six paths sage mode. To further prove my point we can look at Naruto’ case. Hagoromo is no longer the juubi jinchuriki, so he couldn’t have given Naruto six paths senjutsu. Furthermore, Naruto already was a
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, so all hagoromo had to do was give Naruto the sage mode.
Stupid, funny, annoying, unexpected. I could call it a few things too. The only thing that matters is that it’s accruate.