Board Thread:Naruto Discussions/@comment-26866422-20160420152937/@comment-25122992-20160420153958

Because Naruto is the TSB user, and the TSBs consist of all the 5 chakra natures + Yin-Yang release and grant their user these natures respectivelly. Moreover, it's said in the same 4-th Databook that Naruto saved Guy's life through the use of Yin-Yang release, thus it's pretty obvious that the user must master both Yin and Yang release to perform it. Also, the databooks themselves aren't completely free of errors or something like this. For example, on the Perfect Susanoo page only Madara is mentioned as it's user, while shinobi like Sasuke or Kakashi have obviously demonstrated it's use as well.