retaining the BEA suggestion that the aircraft did impact the surface in one piece, could these two types of structural distortions (forward motion & slight twist versus strong vertical compression) also suggest that the aircraft impacted the surface at high velocity with mainly a vertical component (as said by the BEA) but with a positive pich, not only on the belly ? (tail impacted first, snapping off the VS, bending backward the connecting brackets between the floor and the walls, immediatly followed by the belly impact and the compressive stress ?).
Jeff