True, but what authority tells us who is correct? Our own brain? Or the priests we like best? Or our fathers or mothers? Or our husbands or wives? Or our friends? Or random people on the internet?
I am really not trying to start a fight, but I have had to wrestle with this for 20 years and my best option is following my husband. The sad thing is my son is hopefully going to become a priest, but you Tom think he is not, that is the real tragedy of this Crisis.
My opinion...we are living the prophecy of Jeremiah right now, the whole chapter 23 but specifically 23:1-4:
1 Woe to the pastors, that destroy and tear the sheep of my pasture, saith the Lord
2 Therefore thus saith the Lord the God of Israel to the pastors that feed my people: You have scattered my flock, and driven them away, and have not visited them: behold I will visit upon you for the evil of your doings, saith the Lord.
3 And I will gather together the remnant of my flock, out of all the lands into which I have cast them out: and I will make them return to their own fields, and they shall increase and be multiplied.
4 And I will set up pastors over them, and they shall feed them: they shall fear no more, and they shall not be dismayed: and none shall be wanting of their number, saith the Lord. Reference verses 1-2: Realize that we are in a crisis and that the highest authorities in the Church have corrupted themselves and are not reliable. So the priests that we are to avoid are all priests who preach error or heresy. Priests are still being certainly validly ordained, your son should go to where his formation is orthodox and ordination is certainly valid.
Reference verse 3: Faithful trads
Reference verse 4: Where we are now - we have Independents, SAJM, SSPX, various Dominican and Benedictine groups, Servants of the Holy Family, etc., etc.. There are also various sede groups and the list of valid priests / Masses / sacraments goes on. I personally do not include and do not recommend FSSP, or any of the "Canonically regular" traditionalist groups and recommend avoiding them altogether.
My prayer is that their will be some sort of clear resolution in the next 5 years.
I also pray that Thuc line humble themselves and get conditionally ordained by Bishop Zendesjas. But I also pray that the SSPX and the "Resistance" priest and Bishops humble themselves and remove Pope Leo's name from their masses. I know this is too simple and naive, but it doesn't hurt to pray. God can say no.
We are gong on 3 generations without clear resolution, I think that your hope is misplaced here and that it's better to plan for this crisis to persist for another 3 - or more generations, just my opinion.
Do not concern yourself with the validity of the +Thuc line, you have enough worrying to do in regards to the salvation of your soul and the souls in your care. You just concern yourself with avoiding trad priests who preach error or heresy.
The Church has always taught that regardless of one's opinion, omitting the name of the pope from the canon of the Mass is an act of schism, do not pray for that.