In all of this mess of the past 50+ years, one thing that troubles me and won't go away, is whether the orders of priest and bishop in the Novus Ordo are valid, whether in the Latin editio typica, or in the vernacular. Needless to say, this matters. No bishops, no priests, no sacraments, no Mass. And I still don't get why one word --- "ut" --- got omitted from the rite of priestly ordination. It's almost as though someone was trying to make the sacrament doubtfully valid.
I am probably being lazy at this point, by not doing the research myself, but what does Bishop Williamson have to say about this matter?