Unlike the VS, the spoiler panel is coated with oil/fuel/hydro fluid residue. Taken with the central disruption caused when the actuator was torn away, it's pretty safe to conclude that this panel detached when the wing was destroyed on impact with the water.
I'm not sure that this is conclusive.
Both the underside and visible edges appear damaged/scraped/worn. Some thoughts about possible inflight damage if it was shaking hard might still be open.
Not conclusive to me by itself so I tend to move on to the next piece of evidence.
as one poster suggested, you collect the positives and the negatives against the various speculations and then decide which ones are still viable (this is liable to take more than a few weeks for us)