As regards Campos, I do not think there were ever two bishops possessing jurisdiction in Campos at the same time.
You know more about such things than I do, but I thought that for some time there was a parallel Novus Ordo Campos diocese and a traditional Campos diocese. If this is not the case, then I misremembered. The way I remembered it, was that after a while the Novus Ordo tried to take control of the Diocese and appointed a new Novus Ordo Bishop, and then Mayer set up his own Churches and carried on with tradition with his faithful, and then the SSPX Bishops consecrated his successor in Campos.