Doesn't that Washington Post photo strengthen the earlier notion of one of the engines detaching during the ditch?
I'm struggling to imagine that A/C floating with the weight of 2 engines and open doors. With the angle she is sitting in the water my logic tells me that possibly the Port engine is detached. That would explain the Starboard down attitude with the Port wing in the air to counteract the engine weight on the Starboard wing.
Surely with both on or both off she would float level assuming equal lateral buoyancy.