Board Thread:Theories and Speculation/@comment-30323490-20170305205254/@comment-9782468-20170307040704

LegionZero wrote: Point I am trying to make is that Natural Energy should be considered a tool as well. It's not something that can just be given and recieved, it is free for everyone to learn to use. It's not free for everyone to learn to use. Unless you have an enormous amount of chakra, you can't even try to train for it.

Kunai can be held and swung by anyone. And Chakra natures simply vary from person to person (I'm pretty sure anyone can learn to use a basic jutsu of any release, but you need the affinity in order to use very high level techs).