Well I saw early today a thread about why Kakashi can't deactivate his sharingan so I remembered I have a question.
When Ao revealed that he possessed a Byakugan that he had taken form a Hyuga clan member, I found it to be very odd that it was not continuously active, as were Kakashi and Danzo's Sharingan, and that it did not drain an extraordinary amount of chakra because he was not a member of the Hyuga clan, as do Kakashi and Danzo's Sharingan.
Why might that be? I understand that the Byakugan and Sharingan are different from each other, but I believe that any kekkei genkai that are somehow appropriated by a person who does not normally possess them should have some form of penalty that a person born with it should not possess. Why do Kakashi and Danzo have drawbacks for not being Uchihas, but Ao does not have a drawback for not being a Hyuga? That seems to be very unfair, to me.