Nobody but SJB has ventured a response to "ubipetrus'" position on the jurisdiction of the traditional hierarchy. People use the jurisdiction issue to undermine SV though in reality, if it undermined anythingm it would undermine the entire traditional movement and validates new Church with invalid sacraments.
But the jurisdiction issue does not undermine or invalidate the visibility of the Church, the confusion over jurisdiction is merely a reflection of the time of apoastacy we are in which is a result of the shepherd being struck and the sheep being scattered.