Uh... I'm really confused by this. The idea of her stepping foot always being in front of the body only applies to a forward step. Only 1 out of 4 steps in the molinete she is doing around the leader is a forward step. (unless she is just walking around him in all forward steps, but I doubt that is what leaders discussing this are going for is it?) And if she is doing "crossing" ochos, even the forward ocho step doesn't go forward of her body.
I've done molinete with leaders who do a pivot, embellishment or enrosque while I go around, all while in an apilado lean and sometimes a true lean where there is weight sharing (not "the lean is just an illusion" type of apilado) Having me not vertical doesn't seem to hinder these leaders at all, but having me change the amount of lean or forward projection partway through probably would.
Granted, this may be one of those instances where size matters... If the guy isn't much heavier than I am, maintaining the counterbalance while pivoting is probably much harder. However, the only ones who seem to do it without opening the embrace (and therefore making me vertical) are the ones who are bigger than I am, so that counterbalancing me is hardly felt.
Ok... now I've twisted myself around in my head. Never mind...
But I still don't get the point of the thing about the stepping foot always being in front of the body since that would only apply to 1/4 of the steps and only if she is doing pivoting type ochos, not crossing ochos.