I'm looking for an explanation. Perhaps you could explain how the following canon of the Council of Trent does not apply:
“If anyone says…that those who have not been rightly ordained nor sent by Ecclesiastical and Canonical authority, but come from a different source, are lawful ministers of the word and of the sacraments, let him be anathema,” (DZ 967, 960)
Archbishop Lefebvre was an Ecclesiastical authority.
He was Archbishop of Dakar when Pius XII died. So i guess a 'sede' would argue that his jurisdiction was limited to Dakar.
The SSPX would say that he was a Titular bishop from 1970 onwards. That would mean he had no jurisdiction.
Some have argued that he lost all at Vatican II.
In short he did not have the authority.
He was an ordained Bishop, therefore, he could ordain priests to the episcopate. The highest law of the Church is as follows:
Can. 1752 In cases of transfer the prescripts of can. 1747 are to be applied, canonical equity is to be observed, and
the salvation of souls,
which must always be the supreme law in the Church,
is to be kept before one’s eyes.