Board Thread:Naruto Discussions/@comment-26866422-20160420152937/@comment-4912646-20160421043123

About the TSB being Yin-Yang or not, in both the manga and databook they're said to be made up of all seven natures (though the wording is unclear whether it's Yin and Yang separately or Yin-Yang combined). But the databook also says something about the natures inside the balls being combined to produce different effects, right? So couldn't the balls always contain Yin and Yang on their own, but only nullify ninjutsu (Yin-Yang Release) when they're deliberately combined? That makes more sense to me than going against the databook's words and assuming they don't contain Yin/Yang by default.