New chapter somewhat confirms this. But Kaguya had both.
So we can somewhat assume that she had the Byakugan from birth..
Making the Hyuga clan the oldest confirmed clan in Naruto universe
And when stealing the fruit she develop her third eye, 3 tomoe/Sharigan from God Tree/Jubbi
Which means Kyuga with Bykugan + Sharigan made
Hagoromo/Rinnegan which in turn started the true
Sharigan clam with Indra
So we can somewhat assume that she had the Byakugan from birth..
Making the Hyuga clan the oldest confirmed clan in Naruto universe
And when stealing the fruit she develop her third eye, 3 tomoe/Sharigan from God Tree/Jubbi
Which means Kyuga with Bykugan + Sharigan made
Hagoromo/Rinnegan which in turn started the true
Sharigan clam with Indra
What if the other son got the Byakugan? The nameless one...