@Halvtand The kaiten on its own is a pretty good reason to learn it over most other forms, and it's a martial arts style that lets you do massive damage with a touch. I'm just saying that if it's something that
can be copied, derivatives would presumably exist in more than one place. And... well, it just seems bizarrely unlikely that the defector would be a Hyuuga, then have the rest of the family do nothing about it. The rest of the family, mind, apparently letting either some sort of genius go or the main branch--since, hey, Kaiten isn't part of the basics. And then this advanced part is perfectly copiable? It's a really convoluted train of thought for one ability. @_@
Also I do worry about having a character with some sort of familial obligation to kill a genin. That's just awkward. xD