I suppose the northern arc might have been extended far enough to allow landing at an ISIS-held airfield. But that would contradict Doppler analysis, which indicates the plane actually headed south. Also, if the plane had headed north, it's extremely unlikely that it would have escaped being tracked by at least one of the radars of the various countries there. And, if it had landed in ISIS territory, it's highly likely US intelligence would have seen it, along with the trenches dug to hold the pax.
But any theory involving a stop at Diego Garcia is strictly tin-foil hat stuff, as it would require the active cooperation of the US military. Too many people would know about it, some of whom would be loyal to the United States and not to the Obama Regime.
The best theory I can come up with is that the captain hijacked the plane, locking the copilot out of the cockpit. Then the remaining crew and passengers attempted to break into the cockpit, whereupon the captain attempted to subdue them by decompressing the cabin. Only something went wrong, and he knocked himself out as well. The plane was headed south at the time and flew on autopilot until it ran out of fuel.
Lot's of unanswered questions, the primary one being, What was the captain's plan? Also, there is the possibility a third party did it, and the flight crew are both innocent.
One interesting detail: Apparently, the copilot's cell phone was turned off on departure from Kuala Lumpur, as is normal practice. However, it later checked in with at least one cell tower at some point after the plane deviated from its planned route. That would be consistent with the copilot turning his phone back on in order to issue a mayday, failing to get service, then, in the heat of the struggle, not noticing when his phone actually did get service. Too bad he didn't have a text message to his pilot gf queued.
That’s sounds logical. I suppose one day we’ll find out, unless it’s all in one piece somehow, at the bottom of the ocean.