Board Thread:Naruto Novel Discussons/@comment-25319479-20150725151541/@comment-4271790-20150727110126

Norleon wrote: Guys, this may be a really, really stupid question, but I never bothered that much with the KG, so here goes nothing: Where was it stated that there's only one single Kekkei Genkai possible with the combination of two Nature Releases? Namely, where was it written, that Water + Lightning = Storm and nothing else? True. Fire + Earth = Lava Release, but it can vary from acidic mud, quicklime, vulcanised rubber, etc. Same Fire + Earth combination, but different substances.

Likewise, as for Mud and Wood Release, maybe the difference between them (aside from substance) regardless of the same Earth + Water combination is the ratio of each element? For instance, Mud could be 80% Water, 20% Earth; Wood could be 80% Earth, 20% Water.

But that's just a baseless theory/educated guess from me.