Yujiro is a literal demi-god, and his power transcends ANY and ALL beings. Itachi may be a tough ninja, but Yujiro's physical stats easily surpass him. Yujiro's "The Strongest Creature on Earth" ability grants him an insane 500% stats increase, making him nigh-unstoppable. Itachi may have some tricks up his sleeve, like his illusions or regeneration, but Yujiro's Invulnerability and Warrior abilities will make it hard for Itachi to land a solid hit. In addition, Yujiro's Testosterone Superiority will violate Itachi, who he deems weak. Even if Itachi were to retaliate, Yujiro's Hard Way ability will grant him an additional +900 power, making him even stronger. Yujiro's overwhelming power and toughness make him an unstoppable booty warrior, and Itachi is simply outmatched.