Dexter doesnt have the huge imbalances that Phil has though, better lines. But yes he, Flex and Shawn were all narrow. Flex gets hugely overrated. He was spot on a few times 93, 96 AC. Shawn and Dex were far better career bodybuilders.
Shawn was really not a better career bodybuilder than Flex , he won 2 pro shows , Flex won 17 that's a massive discrepancy , Shawn may have been more consistent from show to show but he didn't compete as much
Dexter is close to Flex in terms of career wins etc , and he also won an Olympia which Flex never did , But Flex at his best would leave Dexter for dead at his in my opinion