Board Thread:Theories and Speculation/@comment-5119417-20150524174321/@comment-26387916-20150525074455

I believe that description is too vague. The databook is not always reliable. Some information between each has been altered or misconstrued (heights, birthdays, technique-related requirements, etc). However, there is only so many techniques that can be "unique" for each individual Uchiha clan member's eyes. I believe most of their special abilities, can be acquired through transfer, emotional means or "hard-earned and dedicated training".