Do we actually know, other than third hand unsourced rumours from Reuters or the WSJ :
1. if the thing actually flew through the waypoints then turned to the new tracks, or just flew near them ?
2. when Vietnamese or Malaysian air traffic actually declared a SAR phase and messaged this to neighbouring country's air traffic services organisations ?
3. if Burmese or Bangladesh radar ever painted anything ?
4. if 'goodnight' etc was all that was said (bad) or was just tacked on to the end of a normal frequency change acknowledgement (good) ?
5. where the story about the new wpt in the FMS came from ?
Until we know these for sure, all that we know is that the aircraft is ... missing.