SLFplatine said
That there is a 50% possibility the flight ended at the southern most reaches of the Indian Ocean could indicate an attempt to return to KL which an incapacitated flight crew was unable to execute beyond setting HDG
The problems come in it getting there - or more specifically, back over the peninsula in the manor it did without a crew. Also the issue of ACARS having completely failed to alert anyone to said catastrophic event taking place. (although it appearntly, per Malaysian Press Conferences at least, let them know of WP changes (at least 2) in the last report at 1:07)
Possibility of incapacitated crew after exiting the Straights(/radar) area; very high. Up to that point though; unbelievably low. (and that seems to pretty much be the Official stance of the Investigation team, so...)