Thread:Kazuki Shinji/@comment-25771248-20150403104902/@comment-25771248-20150405122453

Gekihen was partnered with a Hyuga in his Anbu days, and observed the use of the gentle fist and other techniques before taking his eyes. Again, he trained to hone it in secrecy, recreating every technique he saw from his previous partner. Neji learnt it from his sheer ingenouity and was able to wield main members' jutsu. Gekihen used his ingenouity and years of observing his anbu partner fight, and honed his skills for two years before defecting. Ao just stole an eye, he did not have the experience Gekihen does. It's unique to the Hyuga Clan, but that does not mean a wielder of the Byakugan (which is required for the style) cannot be able to learn it. The eyes grant perfect chakra control (each and every tenketsu) and Gekihen trained hard for TWO years before defecting. Then he became a missing-nin for years, his skills would be beyond perfect.