Well, bbing is pretty subjective. I never thought Mike had a weak chest. It wasn't his strong suit but it wasn't weak. He was so thick in the arms and shoulders that it overshadowed his pecs. That why today's guys don't have the look that Arnold, Lou, and Serge had. Modern bbers are bigger everywhere today but they don't have the look in the their chest that those guys had because of the thicker arms and shoulders. And exercises isn't going to change your natural genetic propensity. Mentzer had a thick dense chest just not that full balloon-type pecs Arnold had and no amount of presses would have changed that. The main difference between a bench press and the pec deck is that with the bench you are assisted with your triceps and shoulders with the pecs having only a partial range of motion, and with the pec deck the resistance is more directly targeted towards the press throughout a full range of motion. I don't see how adding assistance with the triceps and shoulders through a partial range of motion like the bench will result in thicker pecs. And, BTW, Mentzer super-setted flies with a pressing movement like inclines not with pullovers. I don't think he ever did pullovers as a chest movement.
Look at Mike's back. Very smooth and very shallow trap development with no midback.
I also think Mike had weak back detail and thickness.
I interviewed Mr. Universe Ahmet Enunlu, he took third place just behind Mike.
He said he was “muscularly obese” his midsection muscular but hanging, lack of pectoral thickness and absolutely underwhelming back detail.
He definitely had a wide back but lacked 3d thickness and detail.
He also seems to have a compact frame, he looks fantastic on his own but even with his amazing delts he doesn’t seem extra wide next to ordinary people.
I suspect his hips were very narrow and gave him illusion of a larger frame.
