No I dont think it's possible to sound that composed under duress, from what I remember the hand over and transcript sounded completely normal, as we do day in day out. if we look at the minute by minute time frame leading up to the 'event' the normal hand over is quite eery. It could imply that crew member had no clue about what was to happen next or was in on the plan. I have not reviewed in depths the flight path and altitudes of the aircraft after position IGARI, could it show some form of a struggle in the flight deck? Of course everything after IGARI is guess work, which is why more should be done to investigate the pilots, that's information that can be obtained, even if you need to go through it 100 times, it might uncover something to help. I think your theory Algol is that right direction.