Assuming that Bp. Roy is telling the truth, and we have no reason to doubt him, this is nothing to the point. If Abp. Lefebvre omitted the name of Pope John Paul II from the Mass during the years 1988-91, so what? This does not imply that Abp. Lefebvre denied the papacies of John XIII, Paul VI, JP I or II; neither does it imply that Abp. Lefebvre accepted the Siri Thesis, a thesis which I have commented before is patently ridiculous. Siri was a Cardinal who never attached his name to the Ottaviani Intervention, never, as far as we know, condemned the Novus Ordo Missae, and never defended his "papacy." Why hold onto the Siri Thesis? It seems more plausible to say that the Church has been without a pope for over sixty years than to defend the Siri Thesis. Overturn my objections to the Siri Thesis and I will gladly abandon course.
But as to the Sede obsession, it seems to me that the only real issues are: avoid the NO Mass because it is sinful; tell others that they must become Catholic if they ask, because there is no salvation outside the Church; and receive valid sacraments from a valid priest/bishop. Anything outside of this seems to us a distraction. And besides, who in this Forum really believes that were Bryan Shepherd to die today that God would send him to hell because his attitude is, "Hell, I do not know if Francis is pope or not, and do not really at this point care, and as long as he acts like a heretic I am not going to do what he says anyway." And then God says, "Oops Bryan, you screwed up, I gotta send you Hell, you got the whole Francis question wrong!" This is totally ridiculous, making a monster out of God.