Judging by the picture of the CEO inspecting what appears to be the largest piece of wreckage around, with the crater in the background, it must have involved considerable kinetic energy to dig that size of a crater and displace the apparent volume of surface soil banked around it, particularly given it is hard African terra firma. The extensive scorched earth around the area of impact is evidence of instant atomisation and simultanious explosion of the on board fuel. It is somewhat reminiscent of the early B737`s un-commanded rudder deployment accidents. Wing over and almost a vertical dive, 80t +, at over 400kts. Considering the height reached before the event, somehow I cannot quite envisage stab/elevator to have achieved what must have been a very aggressive control input.