Mr Optimistic;
Whatever happened to the oilsick ?
It vanished, i.e. evaporated or dispersed.
Was it ever taken seriously in choosing the search area ?
It was discounted due to it being well outside the area of probability calculated by the Drift Group.
Though it does fall within the statistical probability area defined in the Metron Report, and the area will be covered in the current Phase 4 search.
On a separate point, whats the current view on the condition of the aircraft at the time the first ACARS message went out: was this the start of the event or some point down the chain ?
Ops not normal, and 7 thousand or more posts on this and the AF447 thread later, the only satisfactory answer will (possibly) be revealed on recovery of the CVR and DFDR.