I just think literally they would suck it in, struggle to blow it out due to the stiffness of the rig, tilt up and the lead would sink the hook home, I just think the lead comes into play as soon as the hook is in the fishes mouth and it gets pricked, it's not getting the time a boom section allows it before the lead does its job,
Why are PVA bags so effective? , if the carp is quick enough there may be a big pile of pellets and a nice neat hookbait bundle,like you see in tank test videos,but usually the small fish will ruin that in seconds,personally I think the short hooklink has a lot to do with it,