That's the First Golfer I've ever seen that presets his Hips for the Downswing.
What exactly do you mean - the big slide towards target during the backswing with a little turn and then just holds them still for release and impact?...hardly any hip motion through downswing until "follow through"?
I agree with mb about Sadlowski...very similar but does not get the hips open enough IMO...
here are a few more views of Ellebye:
Salowski really gets his hips more open and moving at/through impact it seems...: