I just read the excerpt you provided...astonishing, isn’t it? I was surprised in the difference in leg length, not just overall height.
The difference in appearance that 4" in height bring are enormous, going from 5'5" to 5'9" is a huge difference and I am certain that there are other morphological differences as well.
Nutrition and environmental conditions during growing can greatly affect the end result of an organism.
Anyone smarter than a fence post has to wonder why our evil leaders want to "vaccinate" all of our children with the clot-shot shortly after birth.