Board Thread:Theories and Speculation/@comment-45444155-20200506094659/@comment-3568954-20200522043248

the paper doesn't transform the chakra into an element, as its chakra not the actual element. when naruto creates a Sage art:lava release rasenshuriken, its not real lava, its just a ball of chakra with the PROPERTIES of lava.

with the paper kakashi stated it was special paper and was designed to react to a persons chakra with a specific effect, it burns if your affinity is fire, it crinkles if its lightning, it gets wet and soggy if water, it crumbles if its dirt and it tears if its wind.

the entire premise of this post is based on flawed assumptions

you said

'''he has wind energy in his body by default (spiritual, physical and wind energy, LOL), which when added to the chakra gives Futon / Wind Release?

''' this assumption flawed because A, he doesn't have wind energy in his body by default as there is no such thing as wind energy, its not a matter of combining spiritual, physical and wind energy, its simply a matter of combining spiritual and physical energy together via chakra infusion, then transmuting its nature into the properties of wind, by grinding the chakra together to a real fine point until it cuts and then acts like wind, and i repeat ACTS LIKE WIND, its not real wind its just chakra that behaves in the fashion of wind.

as for the affinity of an element, the series doesn't go into any details of what contributes to a persons natural affinity. the Uchiha tend to have a fire release affinity yet Sasuke's actual Affinity is Lightning.

for all we know it could simply be that a shinobi trains in an element and via constantly changing the nature to the element there chakra simply changed so much that when they have a kid said kid can use that nature more efficiently, but we have no real definitive answer because the series never went into any details