Of all the things I have read and heard about the Thuc consecrations there was one thing I have heard that made me have doubts about the validity of his consecrations. According to Hobson (cathinfo will not allow me to link to his website, which may not be trustworthy) Thuc admitted to pretending to consecrate people while secretly withholding the proper intention so that these people were not really made priests or Bishops even though the ceremony occured, and he admitted to doing this multiple times.
I don't believe that this is true. Anything Hobson says, you can be pretty much certain that the opposite is the truth. +Thuc admitted to consecrating most of the bishops he consecrated, and at one point apologized to Rome for it.
Also, there's a misunderstanding of "intention". Even most Traditional Catholics have this wrong. If you outwardly DO what the Church does in order to confect a Sacrament, you have the intention to do WHAT the Church does. Even if you sit there in your brain saying "I don't intend to consecrate", it doesn't change the fact that you are intending to DO the rite of consecration, which you know (the Church declares) creates priests. Same thing would apply to a priest offering Mass. He could not believe in transubstantiation and think, "I'm not really consecrating anything." or, if he believed, think, "I intend that transubstantiation not happen," but the Mass would still be valid if he PERFORMED the rite according to what is prescribed by the Church.
You see, the Sacraments are matters of the public form, as is the "intention". If some kind of "internal forum" considerations could invalidate the Sacraments, then one could NEVER be certain whether one was receiving the Sacraments.