Board Thread:Naruto Discussions/@comment-3568954-20150829054929/@comment-3568954-20150829061949

Chapter 78 doesn't actually mention anything about secondary Kekkei Genkei it simply says

the byakugan is one of the advanced blood abilities passed down in the hyuga house its an eye ability similar to the sharingan but in terms of ability of insight it surpasses the sharingan

all of there abilities can be attributed to the byakugan and solely the byakugan, unless they have some kekkei genkei we have never heard of before. the ability to see chakra is from the byakugan, the ability to expel chakra from the tenketsu is also an ability from the byakugan. never once do they mention there powers being from anything other than the byakugan