Within normal stance widths, if you do this, you must make a huge lateral shift to get back to a position to be able to hit the ball effectively. Viewed from the front of the player, if you properly preserve the angle of the right leg, this is impossible. Ballard teaches this - laterally shift the right hip over the right foot, rotate around the right leg, laterally shift the left hip over the left foot, rotate around the left leg. Notwithstanding that this method won 2 consecutive US Opens, a better way is to rotate into the inside of the right foot in the backswing. A pressure shift rather than a weight shift.