Hi bear
Yes I do recall that item (or an item that fits your description) but my recollection is that it turned out (on analysis) to be non-aviation related (such as bunker fuel). Because the BEA made no connection between the two "stains" I have been surmising that they (BEA) decided they were two different items.
So I'm searching now to find the specifics of the one you mentioned (spotted early on) to confirm when and where it was located. That information -- along with confirmation that the satellite observed stain was no longer apparent after 3 days -- would resolve whether two are in any way related.
cheers,
grizz