Regarding 'how they got where' the '57 up' is all part of the route to 51 down. I think we are all pretty convinced, are we not, that the '57 up' was power/pitch?
We are ... but the power/pitch was not manageable due to the excessive THS up position which got there because of the faulty AoA sensors that were telling the same lie and
silently discarded the only probable (?) reliable AoA data.