I have the book Alexxx I'll have to recheck. I still think what you describe is a gentic fator not a training one.
Law
Arnold: The education of a bodybuilder
Page 70-71
"One point in my favor was that my body has always been dramatic and spectacular, more than the average bodybuilder's. The main reason for this is a trait I share with Reg Park. I look very symmetrical when I stand relaxed, without the too-wide, squared shoulders and the arms that appear propped away from the ribs by a surplus of muscle that characterize most bodybuilders. I've never minded that my body doesn't look massive when I'm standing relaxed. It has always had a nice muscular look, but nothing freaky or unusual. I never tried to tense it up, to get musclebound. However, when I posed my whole physique would change radically. My body would open up like an accordion and my muscles would appear. Even in terms of measurements the difference was phenomenal. Hanging, my arm would measure 19 inches; when I flexed, it would balloon to 22 inches. The same thing was true of my chest. I could make my chest expand so dramatically it shocked people; tthey didn't know where it came from. My thighs always looked thin, too, but when I flexed they exploded. It was a direct result of working with more repetitions and less weights. Because if you always train with heavy weights you get to look like Franco Colombo; your muscles are always there. Then when you pose there's no real surprise. I don't want to knock that look. For myself, I prefer the more dramatic body, the showman's body."
Make your own judgement. To me there is no shortcut. Champions are built with volume, sweat and blood!