I think it highly possible that hamura had the byakugou.
Notice him a baby
The both clearly have forehead marks,
The sage seemed to have got the rinnegan spirals on his forhead, and even the color of it....most likely a devolved version of kaguya's third eye, the sage has the eye, and humors has the chakra....basically what the yinseal is.
And notice the lone bang covering the spot....just like Kishi did when hiding Sakura's seal
Notice him a baby
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The both clearly have forehead marks,
The sage seemed to have got the rinnegan spirals on his forhead, and even the color of it....most likely a devolved version of kaguya's third eye, the sage has the eye, and humors has the chakra....basically what the yinseal is.
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And notice the lone bang covering the spot....just like Kishi did when hiding Sakura's seal