I think you're both wrong. :D
If you weigh 80kg and you are going 10m/s around a 5 meter turn..... there is going to be exactly 1782.1 Newtons of force applied to your board (about 400lbf!!). No more, no less. Your body position has nothing to do with that. You CAN dictate WHERE that force gets applied - more to the front foot, more to the back foot, or even.
Whether you use EC style rotation, or you align your hips with your bindings, or you turn more square to the nose, only serves to put you in a body position in which YOU feel the most balanced, and best able to deal with the forces involved.
Any time anyone says, "do this, it puts more pressure on the edge"... well, it just makes no sense to me.