Board Thread:Naruto Discussions/@comment-3279282-20140413164418/@comment-732150-20140413172104

Because it makes no logical sense for one to have an ability that allows you to to combine X and Y if you don't have them. How would you even know that you can combine X and Y into Z if you don't have both in the first place? Chakra naturally leans toward a nature transformation, kekkei genkai holders probably would have their chakra leaning toward the components. The very fact you can combine the natures means you'd have to have them for them to combine. If you get them through DNA, you obviously have them to combine.