if there is no incest then there is no hyuga clan
I don't think Kishi would try to imply incest in a shounen anyway lol
Marrying a distant cousin isn't incest. It's something the Uchiha and Hyuuga most often times did, anyway.
in·cest
ˈinˌsest/Submit
noun
sexual relations between people classed as being too closely related to marry each other.
the crime of having sexual intercourse with a parent, child, sibling, or grandchild.
Incest is more like first/second/even third cousin and your direct family (mother, father, brother, sister whatever). No one has done that in this series.