Jim Jeffries was 6`2-6`3 numbnuts and not lean at 200 lbs.
jim jeffries nowhere near 6'2"/6'3". watch the johnson fight. are you saying johnson was 6'6"? he was closer to 6'1-2 and, btw, he was 210-215
about the only boxer (of any notoriety) at the time who was over 6'2" was jess willard and he was considered a giant at 6'4". btw, willard weighed 260lbs.
joe louis weighed 210 lean with abs 1930s. jack dempsey 185 but very cut 1918 - 1920s. hell, marciano was pretty cut at 5'9" 183lbs, but he was 1950s so he was probably using steroids right?
most of these guys absolutely avoided weight training because they and their trainers believed that weight training made you muscle bound and slow, so they are not even good examples.
i can't be fucked looking (not interested), but i'm sure there's plenty of strong men, gymnasts, weightlifters, whatever that are better examples.
my point is there is plenty of evidence to PROVE that your theories are bullshit. they promote body destruction in the natural athlete, not bodybuilding.