Perhaps, I don't understand the radar in that area, did the plane beep beep beep then gone, or where they in not in radar territory or.... I fear I don't understand the basics at this point well enough to have a valid opinion except that a catastrophic event seems likely. However, again, if it wasn't like beep beep gone, then is it possible it was dropped to a low alt and hijacked, hence leaving no debris, but of course IF, and I'm totally in the dark, but if a plane of that size is virtually always on some form of tracking system, then I would think any descent would be recorded somewhere.....
It's a mystery for sure. Bomb doesn't make sense, malfunction doesn't make sense, and hijack doesn't make sense. What else is there? Majick, hand of FSM,...?????