Board Thread:Theories and Speculation/@comment-3568954-20150210145020/@comment-1512913-20150210153625

I already mentioned this in another thread in fact. Naruto has more than 50% of Hagoromo's chakra, let's say 60%. The first Huyga (Hamura's human descendant) had 50% of Hamura's chakra. With Hinata being directly descended from that person, she should have chakra similar to Hamura by less than 50%, depends on how much outbreeding the Hyuga allow, knowing the exact percentage is impossible (even Kishi didn't think of that in so much detail lol), but her chakra is apparently still similar enough to his even after so many generations of Hyuga, so let's say Hinata's chakra is 40% akin that of Hamura's. (they managed to keep it to that level by more common inbreeding than outbreeding).

This means that Boruto and Himawari (having a half of chakra from each of their parents) have 30% of Hagoromo's chakra and 20% of Hamura's chakra. So even if they didn't inherit the correct genes/chakra for any Kekkei Genkai fancy business or whatever, they should still be very powerful nonetheless. But yeah, Boruto and Himawari have chakra closer to Hagoromo than to Hamura, so no wonder they don't have the Byakugan.