What are you seeing the evidence that leads you to believe that pressure feeding from opposing ends of a gallery stops flow at some point along the gallery. Is there a hydraulic principle in a book or some where on the Google machine that that explains how this could happen? I might be persuaded if there was an explanation for the physics behind this. Maybe Pascal's law can explain it.
I can see how G forces could affect flow in a fuel system during a hard launch. But I don't think we are talking about the loss of oil flow from a hard launch. So I don't see how that relates to pressure feeding from opposing ends of a gallery.