Board Thread:Theories and Speculation/@comment-27082825-20150116155842/@comment-27082825-20150121153334

BeyondRed wrote: Haven't seen it brought up yet, but the anime has been making up rules on nature transformation for a long time. In episode 63, Yamato claims that shinobi have secondary and tertiary affinities (not sure about the actual term he uses) aside from their main one. His explanation fairly explicitly states that you have to be born with a nature in order to acquire it through training, otherwise you can never use it. Naruto asks if he can eventually learn Water Release, and Yamato tells him he'll have to find out if he was born with it.

Of course, we have since learned that isn't the case, just like his other statement from that same episode that no shinobi can use all five natures.

One response I have for this is Yamato could of just stated his belief on the matter, not proven facts. Moreso, proven facts to oneself, a philosiphy used quite often in todays society. As for the databook releases via elements, did anyone ever consider that those were just potential elements or at the time of the epilogue. It seems like many just assume that the 1st and 2nd Hokage used all 5 elements, or that Kakashi did indeed have wind release up his sleeve, when it is just as possible that all of that was just what could of potentially been obtained. Backtracking toward the topic, is the Chakra Paper even canon?