jcjeant,
Thanks for the debris-field pictures from a French forum, which seem to be much sharper than I can get from the BEA website.
Like RR_NDB, I could only follow their interpretation it if the aircraft was flying inverted, which they may not have intended to suggest. They also seem to be treating the debris-spread as if the aeroplane had crashed on soft earth: allowing all the lighter parts to continue forwards, but the heavy/dense parts to dig-in. Do you see what I mean?