LOL look how much thicker and bigger Yates back is, all his muscle groups are much more defined.
yates back is not thicker and bigger or wider than Nasser's.
it appears drier.
it may have been a genetic predisposition that Nasser was not able to get his back as dry as the rest of his body because there is no doubt he always came in great ripped, shredded and striated condition.
so it is not a question of body fat but fluid, hence nasser's back doesnt appear as dry as the rest of him
for some BB's, eg lee priest, he holds water in glutes and hams (never had striated glutes)
to say Nasser's back was not thick and wide and detailed shows your ignorance re BB.