I would say that it is down to the twofold character of the "drag" and the "hesitation". There are only two weight changes over three beats, and when I lead the figure, I make a RF movement very similar to that of a heel pull (ie inside edge of foot), and bring the body weight over the flat foot as I drag in the LF, only rising at the end of 2 ready to lead (usually) a back lock.
If I rose at the e/o 1, as in a normal reverse turn, I dan't think that my partner could discern the lead correctly, and the drag & hesitate movement would falter.