Yujiro does have stuff to deal with Meruem, actually.
Aiki is one example, allowing him to deflect Meruem's high AP punches back at him. It's stated canonically that "No matter how strong the attack, yours will always be stronger." In essence, a martial art "No U".
Furthermore, with Defensive Shaori, he can present zero resistance to oncoming attacks, which will make him unable to take damage from punches, kicks, slashes. The feats of this skill are actually insane, as Kaioh Kaku was able to use it to make Yujiro's punches at full force do nothing but give a bloody nose. After using this, he can use Offensive Shaori to put the entire body weight into his blow, and the force of his opponent's own attack.Kaioh Kaku, who's old and withering, was able to use this to actually make Yujiro bleed and temporarily gain an upper hand.
Then there's the fact this guy knows every martial art on the planet, meaning he has many different attack strategies he can go for against Meruem, who knows little to nothing of martial arts.
And let us not forget his 100% accurate ability to, even at a glance, see someone's vital points, weak points, etc, even down to a cellular level.
Also, there's a question I have. Since Nen is an aura of life energy, and Yujiro has his own form of aura brought from his vitality... Would nen negate his durability at all?
