wings?
The last picture is puzzling: are these the two wings? Or it is a single wing and what is left of the fuselage? I cannot understand how the two wings would manage to be at the front end of the crash without any big other pieces (engines?) around.
The wing boxes are the most robust portions of the airframe and the heaviest because they contained the fuel. Because of their robustness and mass, they continued forward while the more fragile portions of the airframe lagged behind due to less kinetic energy.