Guys, my guess is that the BEA report is deliberately incomplete to hold off the inevitable lawsuits to the proper time, ie. after the final report is published. In my view, it says all that needs to be said, without actually giving anything definite the lawyers can grasp on. Unfortunately it also leaves enough holes for those on this forum who of course know exactly what actually happened to try and squeeze their pet theories into the gaps.
I'd say the "how" , even if not the "why", is clear enough, and the real professionals (should that be singular?) who have contributed to this topic have it about right.