In a jocular vein ...
Were they holding a dance in the aisles for entertainment?
Well, they were fresh out of Rio ...
But regarding things falling in water for about two and a half miles.
IF (big if) the wings maintain their general shape at impact (even if shearing off from fuselage at impact) then during a two and a half mile excursion down (after a brief dwell time at the surface as the internal cavities fill with water and buoyancy is eventually overcome) I'd expect that eventually, with tumbling action, the wing would take on a generally "tip down root up" alignment as the entire cavity fills with water. (Yes, there is probably fuel trapped within fuel tanks that would render the general buoyancy of the wing greater than other pieces as they tumble downward).
I'd expect the wings, were they separated from the fuselage, to be more, not less, subject to currents under the surface than most of the rest of the aircraft.
As I have not been able to view quite a number of the images posted (filter issues on my browser, I suspect), do they depict the wings still attached to, or separated from, the fuselage? Or, am I gettting ahead of it all, and resolution not sufficient to determine same?
EDIT: I had a look at the A330-200 fuel system (outline) from a 1999 era document
here.
As I understand the flow, engines are fed from wing tanks (inner) and wing tanks replenished by the, outer, trim, and center tanks as fuel depletes over time. (Do I understand that correctly? It is a sketchy summary of the fuel system.)
(*Scratches head.* If not, then perhaps the flow is out to the engines from the center tank (via plumbing and pumps) and center tank replenished from all other tanks ...) Not all that important, but of interest to consider which cavities / tanks were emptied or low on fuel at that point in the flight, and how that would influence downward trajectory toward the sea bed.