Board Thread:Theories and Speculation/@comment-36342497-20180726162715/@comment-24572728-20180801202155

Ravenlot 27 spoke the point I was trying to make in a much better and concise manner than I did. Kekkei Genkai (those regarding nature transformations) are advanced Nature combinations that people are just born with the ability to create. You just have the predisposition (inborn talent) to activate it. Hardwork won't cut, just like you can't train yourself into activating the Sharingan or Byakugan if you are not a Uchiha/Hyuuga descendant.

There have been a few people who can use all five basic elements, but that does not mean they can use the KG that involved combining the five elements. Thus, I believe that having a nature KG means that you can use the specific element (i.e. Lava) and by virtue, you can you its parts (fire + earth).

Take the first for example, he is the only personal who can create Wood on his own (we do not count the people using his cells). It's not JUST because he combined earth and water together, but the main reason he could was, simply, he was born with the KG to that allowed earth and water to fuse into wood. Once he tapped into that hidden potential, wood came about. I highly doubt he was the only earth and water user at the time, so why is only Senju H able to do it? Because he was born with it.