Board Thread:Naruto Discussions/@comment-24855911-20140913181717/@comment-3568954-20140927083731

ItachiWasAHero wrote: Yeah, but it's wrong. Kakashi and Obito only had Kamui in both eyes, and you CAN'T copy kekkei genkei, even other mangekyo techniques, otherwise why would Madara rip out Kakashi'e eye instead of copying his technique since he used it a million times around him??

Technically he would not be copying a Kekkai Genkei. the Kekkai Genkai is The Sharingan the jutsus such as amaterasu and Tsukoyomi are simply jutsu that are cast with the use of the sharingan. it is said that the sharingan can not copy KG ie wood release, Lava Release and so on. but Amaterasu and Tsukoyomi are not KG they are techniques that a KG user can cast. so really we do not know if they can be copied by another sharingan and like others have said all that is needed is the awakening of the MS in both eyes