Originally Posted by Chaghatai
total myth, it just turns out that the point of the chin is very good at transferring energy of a strike into the kinda movement that stuns the brain
You are correct, the chin is the spot on the face where the force is most tangential to the rotation of the skull. Having a thick neck will help with reducing the acceleration of the skull and should reduce the likelihood of a brain rattlin'. Genetics play the biggest role by structure, angles of bones and just plain natural resistance. Neck strength and neck mass would help but are no substitute for just being born with a Cabbage head.