The weekly operational update from ATSB includes some discussion of the flaperon:
Operational Update
and links to this discussion of drift models and debris:
MH370: Aircraft Debris and Drift Modelling
"Over time, all floating debris will become water-logged and then sink."
"Most recent drift modelling indicated that the net drift of most debris in the months to July 2015 is likely to have been north and then west away from the accident site. The drift analysis undertaken by the CSIRO further supports that the debris from MH370 may be found as far west of the search area as La Réunion Island and is consistent with the currently defined Search area."