What is the name of the trad bishop you were speaking with?
It is highly unlikely that a spouse will reveal an abusive tendency that is not already apparent. I wonder why you say that severe abuse is insanity. You can pretty safely say that severe abuse is grave sin, but not grounds for annulment.
Probably a "garage bishop". You know, any priest with the right connections COULD become a bishop. And the path from layman to priest CAN BE equally slick and quick, in this wild-west world of Tradition.
Why is a man's opinion or advise automatically worth more, just because he's been consecrated Bishop and he follows pre-Vatican II liturgy, morality, theology, and philosophy? It's not like he gets special graces of state to not err, to be a great theologian, or to have the best/most Catholic opinion on every matter. The Pope didn't choose him. He has no jurisdiction; any "Trad" bishops are just sacrament-dispensers, who operate under emergency supplied jurisdiction.Just look at Fr. Pfeiffer. He got himself consecrated*, even though he has committed public sins against fellow priests, is working with a warlock, his "seminary" is a laughing-stock, etc. There is much to criticize on a moral level, even from older and sober priests like Fr. Voigt, who aren't going to raise a fuss about "nothing". They stick to real issues when they raise their voice.
Now this is not as much of a problem in larger or more well-organized groups (Resistance, SSPX, even the Indult groups like FSSP) because they require long training for the priesthood. But you have lots of vagus and wandering bishops and priests, and it's very small task, physically speaking, to ordain or consecrate someone. To consecrate/ordain a GOOD, SUITABLE candidate? That's a whole different matter.
*His public consecration video showed grave defects in the ceremony. This was solid evidence for defect of form. His later claim that it was "re-done" was inadequate, as no video was released for that.