We're running away with ourselves here guys, and adding speculation on top of assumption on top of guesswork. The one thing I have learned (painfully!) about accident investigation, is that nothing should ever be taken in isolation.
We have pretty much reached the end of the road now as far as guessing is concerned. I'm not being 'huffy', but what is the point of any more theories and opinions?
There is hardly anything that can be said with certainty here, other than it was a tragedy.
Time to pause. Thank The Lord it wasn't us, and wait for AUTHORATITIVE information?
That way 99.9% of us won't end up looking like total dickheads!