Board Thread:Theories and Speculation/@comment-27082825-20150116155842/@comment-3279282-20150121081641

I know. But in Naruto, it's always one aspect. One nature in the chakra paper, one nature in Kakuzu's hearts.

It's really just that simple: Everyone has a natural predisposition towards one nature. This nature is shown in the chakra paper and is the easiest one to learn for that ninja. We call it affinity. Every other chakra nature is not an affinity, because it wouldn't show up in the paper and would be useless to Kakuzu.