I find some of the theories with 100's of posts a bit to hard too accept, and there is no single point of failure and too many things have to line up just right.
No accident is dependent on a single point of failure. Never. It always ends up being a chain of events. Holes end up aligning themselves with each other, and the worse happens. If they ever find them, and I hope they will, for all the families sakes, you'll see. Whatever happened, it was a sequence of events, of actions that led to this situation.
I've been reading this thread since the beginning, and I am one of the crazy ones who go thru every single post I missed after a good night sleep, I can provide some explanations, but I won't dare to speculate on what happened. Too many variables, too many things I don't know, and too many things nobody knows.
Let's just hope, for a bit. Even if just for them to find the aircraft. Explanations will come much later...