I find it strange that there has been no mention of this mystery on the CS board.

Over the past few days I have been gathering as much creditable data as possible and flying different scenarios. Just completed/crashed this flight:-

After leaving WMKK the CS 772 flight envelope was remarkably close to known data reaching the acknowledged height of FL350 to within a minute and then passing over WP IGARI to within the minute (01:21 local).

Based on non proven evidence I turned sharply toward Panang and increased AP Altitude set to FL450 at 1500 fpm maintaining Mach 0.84, then released cabin pressurization  :-[.  After leaving VPG I tracked to Pulau Perak and as there is no real proof that the aircraft descended to FL120 or less during that leg I descended back to FL 350 and increased speed to Mach 0.9 and reset cabin pressurization (IMHO the perpetrator wanted to be sure the flight would pass the last way point OK before finishing himself off).

I flew via GRIVAL and at IGREX turned true South and depressurized for the last time. (Morbid I know!)

The plane ran out of fuel at 07:56 local, glided for a while then ..... (they're guessing 08:11) S35deg 8.0' E94deg 25.0 just slightly South of the current search area. The CS flight model was very close to known and presumed data, well done.

Just one thing, I'm thinking the cabin pressurization dump and re-establishment should not be instantaneous.

BTW and just my sorry thoughts. I'm putting my money on the First Officer