Originally posted by: Necromas
Maybe long ago the Byakugan clan was split into 2 clans because of some dispute or whatever, and each clan had their own ways, the Hyuuga clan we know today decided to improve their existing byakugan into the powerful bloodline we know of today, and they also made sure to keep it from getting out of the clan with the head and branch families. While the Uchiha clan was less focused on training the dojutsu, but while they were training so hard in other skills, like taijutsu, their eyes became trained to reading movements and eventually became able to read enemy techniques.
Seems possible.

Originally posted by: XanBcoo
Or not.
Lets hear your version.