Are the Primary Radar Returns a Red Herring?
Until the public sees data that unequivocally shows a strong tie between the last SSR response and the Westbound primary track to the North of Aceh, we need to accommodate the possibility that MH370 took another track that ended up somewhere within an hour's flight time from the last ping arc.
That Westbound track is highly redolent of diversion. Perhaps the NTSB and/or AMSA are privy to data not shared with the public that supports this track.