Board Thread:Theories and Speculation/@comment-3568954-20150210145020/@comment-3531945-20150401084356

GodlyHades wrote: Kishimoto said he forgot to give them the Byakugan, but he said he might mak a third child with it ... After that he said that would make things "complicated." My theory is that these children might be able to activate the Byakugan similar to how the Sharingan is formed. They are the first hybrids, and Kishimoto also stated he hates drawing the Byakugan because it shows no emotion, and hard to draw facial expressions with it. So HE might do this. It would be cool This is the most likely scenario to me, I feel Kishi intentionally left it out to avoid the obvious, so that when it does pop up it will be more intriguing.

It's either that or they'll get another dojustu, probably the Tenseigan since the design is somewhat similar to their natural eyes.