Thank you for this topic. I read through and had a few comments.
First and foremost, it is my opinion that Archbishops Thuc and Lefebvre equally represent a formal opposition to Vatican II. Archbishop Thuc was uniquely prepared to defend the Church with his unusual mandate, and Archbishop Lefebvre had every authority to call into question the divergent teachings of Vatican II and exercised good Catholic judgement in his disobedience.
I do not believe it is proper to compare the varying degrees of opposition to the Second Vatican Council. Each person is responsible to God alone, and God alone knows the internal disposition of the person. I consider each person's recognition of the modern errors to be a type of personal revelation, rendering that person responsible for the revelation, but that the personal revelation is not binding on others. This is not to say that multiple people can't share the same revelation, but we shouldn't expect others to be responsible for the revelations we ourselves receive.
I often tell people, I can see the Grace of God working in my life, and I know that God is extending His Grace to others. If we cooperate with those Graces, God will have us where we need to be when we need to be there.
I observe a condition of sede vacante. I am responsible for that observation. I am responsible for the actions I take because of that observation. As Catholics, we are here to assist one another through this difficult time. If there is one thing I can say with absolute certainty, it is that God will always provide.
Prayer is so very essential, as is your Easter duty.
God bless you and yours, now and always.