Spot on Icarus. You know I am starting to think Boeing and FAA are off the hook with this one. That is assuming something new doesn't turn up. If the thing malfunctions at approach to stall speeds control loads are light and any runaway is a non-event. If it malfunctions at higher speed, accelerating after flaps up for instance, it is a straight forward runaway. In either case, follow the memory items in the QRH. So how did it get away from them? Yes. Well. Pre-employment history. The country regulator. Training and checking systems. After that we may be heading into the murky waters of leadership, culture, etc..
It is going to take a while.