Board Thread:Naruto Novel Discussons/@comment-25319479-20150725151541/@comment-2140588-20150728163406

^Well it's kinda hard to fit them because they don't fit into the concept of "canon" and come from different sources of the Naruto franchise:

Crystal Release comes from the anime. Swift, Dark & Steel Release come from the movie, with Steel Release also existing in the novels. As far as we know, it could just be the case that in the anime, or in that specific movie, a certain kekkei genkai does not exist and this(-ese) one(s) just fit(s) its(-their) place. When we get more than 10 canon kekkei genkai, then the possibility of "Same natures creating different kekkei genkai" concept can be discussed. Now it's just a load of "what ifs".