So ACARS never reported gear down, but the aircraft apparently pinged the Iridium network for some time after the aircraft disappeared? That’s definitely strange. I still think they’re going to find out she crashed into the ocean, but I hope for the passengers that they are somehow still alive somewhere.
Looks to me like the plane made the left turn and flew on until no fuel, then went down. Now the question is: why did the crew make the turn and then do nothing? Crew suicide is most likely reason in my mind. Crew did not have guts to nose dive so they just flew west until fuel starvation forced them/him into water.