Board Thread:Naruto Discussions/@comment-27418151-20160117021450/@comment-25122992-20160117113442

In the manga it was never said that it's completely impossible to master all 5 nature transformations. Yamato's statement belongs to anime only stuff (which has a lot of contradictions with the original manga info) + even in the anime it was already proved wrong (Hiruzen's use of this). Moreover, in the Fourth Databook some characters were listed with their nature transformations, even if they never displayed some/any of them, thanks to this we are also sure that Kakashi and other remarkable shinobi (Hashi, Muu etc) possess all the 5 basic elements.