I'm at a loss to understand this obsession with the air speed indicated. The VS/rudder assembly has popped off completely intact with the rudder still functioning (you can see it deflected to starboard in the second linked photo), an even more dramatic event that AA 587. It seems to have been found off by itself (else other floating composite debris would be seen). It seems pretty clear that this is the same scenario as AA 587 - perhaps heavy rudder input during a rough patch. Once the tail and rudder were gone, the plane would starting yawing back and forth until controlled flight was lost, with obvious effect on the air speed sensing.
-drl