Why not pick a fight with someone credible and find out? I remember in high school there was a guy who sounded Just like you , that dope was 300 pounds and could bench a house . i also remember seeing him picking a fight with the best knockout puncher that year who weighed about 190 and the big lug was put in a Coma with one punch....literally!
Nah no fighting around here for me,id have people lining up out the door wanting to take me on. Plus theres no guarantee someone would accept getting a beating,it would go from bad to worse.
2 groups of random test subjects. One trains their neck for, say, a month. One does not. Both take clean shots to the jaw after said month from a machine that produces the same force for every blow. Results are documented. Thered probably need to be multiple studies done