I do believe there is such a thing as progressive understanding.
But saying you were wearing a pair of blue basketball sneakers and then changing it to a black hiking boot on the left foot and then changing again to having one foot bare and one pink sandle on your other foot.........well that's just downright lying and makes you look crazy.
The WTS's understanding is everchanging. It makes them look like downright liars. Don't forget, they like to make their own definitions to words also (example being "generation"). What makes you think their definition of "progressive" fits a normal, sane, human being's explanation?
CoC