Board Thread:Naruto Discussions/@comment-35448581-20150520162940/@comment-25626003-20150521024537

I don't what the fuss is about to be honest. Just because they don't display them in the manga, doesn't mean they don't have said natures. Kakashi himself stated that almost everyone's chakra falls under at least 1 of the 5 basic natures, so.....

And the databooks are classified as canon because they give technique names, explanations on said techniques, and a lot of other information Kishi likely didn't have time (or patience lol) to include in his manga. I'm glad this was confirmed. The problem comes the databook information contradicts the manga.