Should have probably worded that better not lack of distance but knowledge. Yes hips do rotate but do you consciously rotate them is a different animal. Just a thought process here if you were on a snowboard the way you are describing the throw and the hip action would essentially be the start of a 360. Spinning the rear hip would send your left side around the front side and it´s not very efficent way to throw. I imagine if I were to throw whilst on a snowboard it would push the nose of the board down and lift the rear end.
It's hard to describe but it's definitely not the mentality of intentionally trying to just rotate the hips. Like I don't consciously think about rotation or amount of rotation, etc. It is a conscious effort though to come into the plant position withthat loaded up feeling in the hips and torso. You have to be able yo feel the rotation in the hips and especially the torso and backside of the shoulder yo be able to throw correctly. The "one leg drill" (which I believe should be the "two leg drill) actually helps to promote the correct initial hip rotation.