You're now comparing the one of the Uzumaki's strongest seals to Sakura's seal. Again, invalid. And now, he was aiming at various coild in naruto's body not the seal, it's called 64 palms cause it's ability is to close 64 different coilsUm yes he his hit the seal on Naruto's stomach many times, if he could destroy it then the seal would have been broken.