Can you elaborate on the bolded? Are you saying that it is possible that those bishops of the Thuc line could in fact have jurisdiction?
I think that it's possible that at least the first-line Thuc bishops have real (non-supplied) jurisdiction, i.e. those consecrated directly by him. Not sure if it's communicable to the bishops consecrated in turn by these. I don't know that anyone has ever produced a copy of the Thuc
mandatum but if it's similar to known copies issued to others in Communist territories, they were given all authority short of what was reserved by Divine Law to the Pope himself. Not only that, but Thuc and the bishops he consecrated would not have been excommunicated by Canon Law for doing consecrations without papal mandate ... since he had a mandate.