This is a danger all Trads face in the current Wild West. We’ve gotten so used to being alone and independent that it’s easy to make up arbitrary “rules” in order to “explain” a unique situation (ie Vigano coming out of nowhere) which we have no resources to confirm or time to research (is Vigano really a sincere convert? It seems too good to be true. And, if I’m honest, an endorsement from +Williamson has lost a lot of luster because of his openness to endorse all manner of “miracles” and dubious apparitions. +W often “wants” to believe things, so then he finds reasons to do so. This is a real danger.)
I don’t blame Sanborn as it’s a defense mechanism. But he’s also wrong. He keeps moving the goalposts because he doesn’t want to admit Vigano is right. But I also get his “wait and see approach.” It’s a very complex situation.
I won't admit he, or any sede is right, or even that they're likely right because first, I have no reason to say any such a thing, no reason whatsoever - and neither does anyone else for that matter even tho it is apparent that to sedes, such a thought is akin to heresy.
Second, it (sedeism) is only his and their opinion, just their lowly, totally biased opinion and nothing more, and it is based on a confused idea of papal infallibility, papal authority, and heresy.
For me, what I believe is that the truth stated below succinctly covers the whole issue, for me. I understand it does not do the same for you and the others, but it pretty much covers the whole issue for me....
"...If these two Doctrines [Infallibility and Indefectibility] be true, then whatever the popes have said or done, whatever they ever say or do, will not be a violation of the Church's attribute of infallibility. And no matter what anyone does, whether from within or without, he will not succeed in destroying the Church. The enemies of Christ's Church do not believe this, which explains why they will never cease to try..." - Fr. Wathen from his book: Who Shall Ascend?