good example , Tito in many fight fan and expert more then likely hits harder then Hopkins but it was hopkin's over all strength that made the difference in the fight.
Strength is one of the many factors of punching power, but by no means is there a fixed link between the two.
Look at Trinidad/Naseem. They are real skinny without real muscle structure. I think you have to be born with the power. You can hit harder by working on speed/technique but its basically something your born with. Guys that have huge muscles seem to be more of a intimidating factor but it does not automatically make them hit harder.
Has more to do with speed and leverage. Two of the hardest P4P punchers ever, were Bob Foster and Tommy Hearns. They were wiry and thin but both could hit like a mule's kick. Neither were all that muscular but they had other strengths.
I had this same argument with my cousin in the build up to Trinidad/Hopkins fight. Until this day she still thinks she's right because B-Hop stopped Trinidad...
Unless I'm mistaken and Physics does not exist in boxing, it's a very simple formula for measuring energy or power if you prefer of a boxer, the human brain is a powerful mathematical processor, even to walk or step requires lots of processing power, the ability to punch hard requires certain muscles to fire in a wave function with maximum linking and speed of contraction, human bodies have less variation in them than human brains do, the size of a muscle tells you nothing about its twitch fibre density and explosive capacity over its range of motion, training the body is good and well, but the mind needs to be programmed to have effortless control over the muscles it needs to generate power, in computing terms better software beats powerful hardware every time.
Totaally different things. La Motta as an example. Perhaps one of the strongest fighters ever, but not a big puncher.
off course there are some monsters among the heavies. guys like foreman,shavers, lyle and tua were all very strong men who could hit like hell...