I gave you a quote from the Catholic Encyclopedia showing that historically there were "wandering bishops" without ordinary jurisdiction, and no mention they were not Catholic. This is because the laws of the Church require a bishop to at least have a title to a diocese, even if the see doesn't really exist (titular bishop).
The Pope and the hierarchy are still visible in Rome to "supply jurisdiction" for these "wandering popes" but of course, in the sede pet theory not such thing can occur, since there is no Pope. Again, supplied jurisdiction comes from the authority which is wielded by the Pope, and held by the Church (Bishops).
This supplied jurisdiction arises when there is an error on the part of the laymen as to the validity of the faculties, if the laymen were to receive the sacraments from a Priest who lacked faculties and was ignorant of that fact, the Church would supply it. It is the Church that supplies it, not a lone self-proclaimed Bishop hiding in the crowd which is what the CMRI cult pretends.
As said before, the bishop has absolutely no right to his own diocese. It is the Pope who grants the title of a diocese to a bishop.
But the point is, what Trent is demanding is NOT divine law, but ecclesiastical law.
Ecclesiastical Law DOES NOT and CAN NOT contradict Divine Law. End of story.
Pope Pius XII's encyclical about bishoprics in China also reveals that it is not divine law.
Again, the China example does not apply. The visible magisterium still existed in Rome, with the Pope and Bishops. The magisterium must always exist and the Church includes a hierarchy.