His back certainly could have been a lot better.
Who knows if he may have developed a harder look, if his training was heavier....I tend to think soft puffy muscles like dillet and Heath are more so genetic than training style as many suggest.
hmm let's apply that stuff, what's that stuff nobody has enough of LOGIC there we go lets apply logic
pros known to have superfreak genetics tend to train like lazy bitch ass sissys and the soft, weak, unimpressive appearance of their muscles is a coincidence.
or
that the hardness/density of a given muscle can and is influenced by the intensity volume and whether machines are used vs free weights vs combinations
id bet option 2 is the winner