Based on something Sinister said:
I do not disagree with the notion that positioning affects punch resistance.
However, at what point do physical features become the deciding factor in absorbing the force of a blow?
What allowed a guy like Brandon Rios to eat punches like this and smile?
Julio Cesar Chavez to eat this and not even buckle:
Or Erik Morales withstanding this:
Surely it comes down to the skull structure of the fighter? Something that no one can control?
Sinister said:Everyone CAN be knocked out. Just some people are almost impossible to be put in position to be knocked.
I do not disagree with the notion that positioning affects punch resistance.
However, at what point do physical features become the deciding factor in absorbing the force of a blow?
What allowed a guy like Brandon Rios to eat punches like this and smile?

Julio Cesar Chavez to eat this and not even buckle:

Or Erik Morales withstanding this:

Surely it comes down to the skull structure of the fighter? Something that no one can control?