@ tawnybird
At least, by saying that there is no need to "de-power" the left FMC in order to take control of the T7, BuzzBox has a more solidly grounded point than Propduffer.
@JamesGV
Formally, the log on at 2.25am-MYT is on the relevant Inmarsat-computed ping arc. It is assumed close to Banda Aceh only due to the existence of the radar track of an UFO believed to be MH370. I mean this has never been a certainty.
As I understand the works of RichardC10, Gysbrecht or Hyperveloce, when the 2.25 log on is assumed close to Banda Aceh it appears impossible reconcile the Inmarsat data and possible trajectories without large variations of ground speed. According to the end of flight analysis in ATSB report of June 26th, the unresponsive crew scenario appear more probable (given available evidence). I am vainly trying to figure out how this could add-up with large speed variations an neither can I find any logic for intentionally fiddling with speed.