CathInfo.com

What is not being said and needs to be said is there are 2 Thuc lines.  Bishop Moises Carmona and Bishop Guerard des Lauriers.  They are different.

The First post of difference is minor and favors the line of consecrations initiated by Archbishop Lefebvre.

While the consecrations of Archbishop Thuc were conferred in a secret manner, great publicity surrounded the consecrations  at Econe. but after the consecrations of Guerard des Lauriers and the Mexican priests, the attacks on Archbishop Thuc led to their losing their secret character. They became public and Rome provided these consecrations with the notoriety which they formerly lacked.

Second difference favors the line established by Archbishop Thuc.  Those consecrations performed by Archbishop Thuc were performed by someone (?) who had recognized and publicly declared the Holy See lacked a formaliter pope. Two fortunate things followed from this recognition of the absence of any Authority.  It allowed both consecrator and those consecrated to invoke the principle of epikeia in presuming an apostolic mandate and as a result rendered the consecrations conferred, not only valid, but also licit.

Bishop Carmona was the 2nd difference compared to Bishop Guerard des Lauriers.  What is understood is Bishop Carmona was correct.