My 2 cents worth people,
Looking at those marks on the engines, there is no way those marks are due to contact with the runway/ground. If there was contact, there would be some rather large obvious flat spots under those engines. The angle of those marks at the trailing edge of both engine cold stream ducts would indicate that not only half of the engine exhaust cones should be missing/ground away, BUT half of the rear fuselage as well !!! IMHO.
Lets leave it to the expert investigators.