Except (I understand) they have primary radar "confirmation" of a north-easterly course after the westbound one (ie IGARI - VAMPI - GIVAL ....)
That was what I was trying to figure out. I recall reading that days ago but was unsure as to where that info had come from, and if it was primary radar, was it later confirmed by the Inmarsat ping data. Since they have only released info about the final ping it's not possible to tell.
I'm going to trawl back through this thread and see if I can find the reference regarding the theory they flew IGARI-VAMPI-GIVAL.