Hi Mr. Steak,
OK, so please enlighten us why this aircraft was zigzagging through the airspace, flying straight then making turns.
Until some one proves it had LNAV and VNAV command, and hit the waypoints and then did Rate 1's to the new track, I suggest that it was wandering.
Why, if a hypoxic pilot tries to enter a track back to KL but does looses consciouness half way through, depending where he is up to, there won't be any LNAV or VNAV.
Hypoxia will have you pressing the same button, repeating a small segment of a scan or repeating a checklist line, etc, until you drop off, and you will not be aware of it.