It does go into their entire bodies, and even ricochets back. It absolutely discharges through the entire body of the target and even into the canvas/ropes to which they are anchored. But the differences here are going to be very small, and it's certainly not worth getting bent out of shape about.
Yes but not to a significant to degree like you said. The majority of the force is absorbed into the target area. (Head, body, arm, etc.)
Well i'd say that it is obvious that if Joe Frazier lands a hard punch on a light-middleweight with a good chin, say, Alvarez, and a cruiserweight with a good chin, like Gassiev, we should expect a very different result. Similarly, if a Wladimir Klitschko lands a very hard punch on a 200lb fighter with a good chin like Gassiev, and a a 250lb fighter with a good chin like Vitali Klitschko, we should expect a very different result. That's the level I would see it at. But it's not just people, it's things. If you hit a 300lb heavy bag as hard as you can and a 150lb heavy bag as hard as you can you'll get a very different result.
I forgot the title of the thread. Remembered now,about Joseph Parker's stamp, 6'4" 230/240 lbs.His arms could be a bit longer though.
At heavyweight, maybe a lighter fighter with a granite chin has to "learn to take a punch" more so than a heavier guy with a granite chin, in some situations. Due to that "bodily absorption" that goes on beyond whether they can hand their head being rattled. For example, compare a 210 skinny-legged Holyfield against the thick-legged solid 240 pound Foreman. They both had granite chins, but Holyfield had to bend with the wind more, for sure.
I'd say that comes down to training and getting used to taking a punch. A 200 lb guy who has never taken a punch before won't fair too well against Joe Frazier as much as a 150 lb guy. A 300 lb heavy bag is heavier than a 150 lb bag so it takes more force to accelerate it at the same rate. F=ma. If you apply a force to a 150 lb bag and it moves 2 m/s^2 then that same force will only make the 300 lb bag move 1 m/s^2. A guy like Alvarez probably isn't used to taking a heavyweights punch whereas Gassiev is because that is who he spars with.
All of this is true, but it's also true that bigger fighters are capable of introducing more energy with punches than smaller fighters.
The multiplier for having great power far surpasses that of having durability via mass. Hence this https://streamable.com/1ap0g
Once a HW usually weighs more than 265 lbs they become less athletic. That's why UFC MMA has a weight limit of 265 lbs. The best athletic players in American Football , Rugby and Rugby League are usually around 100 to 115 kgs. Can't see why boxing HW no different.
Punch resistance has more to do with anticipation. Max and Buddy probably had similar resistance but in a combat situation the better boxer rides the better punch and his reactions will give the impression of taking a better punch. It's mumbo jumbo to suggest one brother physically has more of a glass jaw than the other even if one got knocked out more easily. The one who gets caught Square more often goes over more often.
6 2 say 205.....problem with boxing for say 6 3 athletes is they often lack the quickness to slip punches well...just reality...but give me more guys strong..skilled...but more confident of a Walcott type...maybe physically he was close to ideal heavyweight contender size...thanks