He really hasn't progressed all that much. Genetics certainly aren't as good as Dad's but he did get Dad's wide waist
Why would he progress like dad? He's a rich kid living in LaLa Land. Pseudo-celebrity in the land of hot and cold running actress and model ass, sushi, Netflix and chill.
His dad was a poor kid from post WWII Austria without a pot to piss in, but that can get you the eye of the tiger.