It would certainly have been better for the author to give Matsuri a chapter, where she invaded Sunagakure, and then got to fight against Gaara and Shinki. I'll cut to the chase. Mind lending us a ...
piercing Gaara's ultimate defense and inflicting a wound that causes the Shukaku's Jinchuriki to howl in pain. It would've been interesting to see how the fight would unfold from this point ...