I just had a conversation with someone authoritative who convinced me I was wrong about Archbishop Lefebvre:
He said that although he himself was never sedevacantist, Lefebvre did not preclude private individuals from entertaining the theoretical possibility.
Regarding the injection of the issue of dogmatic facts into the conversation, this person was undecided, but said that the pre-conciliar theologians could not have foreseen a crisis of this magnitude in the Church today, and implied that the matter of dogmatic facts and the conciliar popes was a questionable matter which he would have to go back and research.
Essentially, it is I who was wrong on these points, and consequently I not only retract my previously expressed opinions and understanding of these matters, but offer to Hollingsworth, Ladislaus, and Byzcat a sincere apology for my aggressive behavior.
Finally, I was told that someone who has written a book such as I have will undercut its authority if the author is seen to be flinging insults around the Internet.
My apologies to all affected.