Chris Scott, color me blabbymouthed broad but I'm going to riff a little. The superposition of the actual aircraft size images on the debris field was eye opening.
What we see, I suspect, is a very broken up, shredded airplane. We have pieces of different shape, weight, and buoyancy. The debris field has probably a shape more related to the currents and shapes of pieces as they fell. Engines and possibly landing gear will be least affected by currents or "flutter" effects. Small relatively light pieces will flutter more on their way down and be more subject to the current moving them slightly.
I'd bet the overall orientation reflects some prevailing current involved. And the width would be related to how much the pieces fluttered as much as it's a function of the current.
If that's accurate then one end has the heavy stuff. And the rest is graded by how much "flutter" and current moved them away from falling straight down. So I'd expect some "astonishing" juxtapositions of pieces.
We're not seeing an airplane there. We're seeing thousands of pieces of airplane all different sizes, shapes, and weights all dropped at nearly the same place into an impressively deep bathtub.
Edit: (Grin - I see BOAC got there before I did. I didn't think he'd make it after saying the plane would sort of fly equally well underwater.)