Board Thread:Naruto Discussions/@comment-25139119-20140705022956/@comment-24384892-20140802215139

Sasuke has even acknowledged Naruto as being stronger than him. Kishimoto never said he wanted to keep the two equal in strength. However, every time one of them, whether it's Naruto or Sasuke, surpasses the other, the weaker one will try to surpass the stronger one again.