People who now try to defend GK simple didn´t read the spoiler or see the panel because:
Law in fact hit his organs, most like even his heart judging his scar is right on the side.
With means Law Gammaknife hit the heart but it doesn´t work because Kaido skin was to tough with Kaido himself proof out after he tank the attack easily:
"Law didn´t hit his organs or heart" is a nonsense claim since both Law and Kaido debunk that shit.
GK wasn´t effective as people believe, it isn´t a top tier lvl, guys with strong durability can tank that shit.
As compare Shanks can tank most like a quake attaack,but a high tier not.
Top tiers aren´t have normal skin, their durability are a whole different lvl.
It was clear that GK who almost kill Doffy can´t kill top tiers who could protect himself with haki or having a strong durability, in fact Kaido didn´t even real feel it, but Killer and the Scabbards did put more damage as Law gammaknife.
With means Gammaknife can´t ignore durability, the chapter literally proof this point.
In compare Killer attack and the Scabbard attack in Ap>>GK, for people who underestimate Killer and the Scabbards, don´t even want to speak about Zoro who mid tier Ap is >>>>>>>>GK...