I noticed the jackscrew attachment lug appears to be intact without the bolt in it. Attachment hardware is usually designed to be stronger than the structures they are installed in. I would have expected that if the jackscrew was separated due to impact, that the bolt, nut and fuselage mounted attachment lugs would be present. It would be interesting to see the bolt and nut and determine if the cotter pin had been installed. It is unlikely but not unheard of for this to occur during maintenance. I had a brake torque ling bolt fall out on a 707 that really made a mess of things upon landing due to a forgotten cotter pin.