What was the genuine 'Last Known Position? Was it really 200nm WNW of Penang VOR (or variants of this), or was it 'close to the Malaysia/Vietnam FIR boundary?
And for Capt Kremin (#7541), if your coloured lines were drawn from the latter, how does that alter the 'final' assumed position?
If the crew made a left turn back from the FIR boundary towards 'home', be it PEN or KUL on HDG (I guess around 190 deg M or so), and were then overcome by events, where would that autopilot have taken them?