Norris had a crap chin,so did Jackson ,and Jackson's stoppage resume is built on cannon fodder,he ko'd 2 class guys,in 62 fights
Jackson lost all his 6 fights by knockout. Lamotta was only legitimately stopped twice,by Murphy175lbs,and Nardico 177lbs ,he was never knocked out.
If that is true how come he knocked out ,as in floored for the ten count ,only 16 of his 62 opponents, and13 of them were nobodies. Four had never fought before. Five had losing records. Four were welter weights. Nine were light middles. Three were middleweights.
Mmmm, maybe its me ! but not sure exactly the point you are making, sort of get most 5-11 guys would have been L-HW or HW, the bit about when not fighting they would weigh 2 & 3 weights above, well of course they would , they would not be training so prone to putting on lots of weight yes ? keep well.