It is really anybody's guess how much, and what, debris the uncontrolled impact of AF447 would have left on the surface.
CJ, good point and a reminder that "uncontrolled impact" is the RESULT, not the CAUSE of this upset. Indeed, the recovered floating debris, while confirming the catastrophe, provides few clues about WHY the event happened.
All the more reason to continue the search for the CVR/FDR. Without hard data from before and during the upset, we are left with a string of ACARS messages, meteorology, and a great deal of guesswork -- not enough information or definition to reach the sort of conclusions expected from a BEA or a NTSB...
GB