Holy fuck. What part of human =/= dragon don't you understand? There's no formula to convert one to another. Law knows what human Kaido looks like and is still guessing.
Holy crap...It is for you to hard to understand the part with the Scar and Law attacking right in the area??
Dude the whole point is that he attack in same spot where the scar lies, where his belly was, what of this part is hard to understand for you?
His guessing was right since his scar was next to his heart, same spot.
He must hit either the belly or heart, two would means he should hit one organ.
Law just made a hole in a random place, and Kaido is literally screaming "AAAAAAAAA", and this dude is like "His skin was too much".
Law don´t make any hole, he didn´t even make much damage, kaido scream more when Law hit him with rocks so the point is useless.
About the skin, Kaido literally point it out in the next page.
Ofc you ignore all the points because they debunk your GK top tier ap shit, even the fucking scabbards did hurt Kaido more with their adv CoA xD