Let's be careful about building fanciful theories or extrapolating the flight data based on FlightAware info. I've looked at several of my approaches that were normal and stable, but Flightaware showed a spike in the data that wasn't factual.
The finite data will be in the boxes. It won't take long before they release some preliminary data from the recorders just to appease the media. Once we get some of that, then we can build our scenarios on facts and not wild speculation.