4. The ET crew followed initially the guidance material
.
Except they really didn’t. The closest they came was the FO shouting “Stab trim cutout”, and then someone flipped the cutout switches before there was any attempt to neutralize the trim. It is not even clear from the CVR transcript that they were executing any “guidance material.” That would have required actually calling for a checklist.
This is about the same level of competence as someone shouting “Fire” immediately followed by someone shutting down engines and firing off halon bottles without any attempt to identify, confirm, and execute the checklist in the way it was designed. There is a reason that we have very specific instructions on how to accomplish non-normal checklists. It has been proven many times in the past that rushing through an emergency procedure can have a bad outcome, and this case was no different.