GB,
don't forget that oceanic currents in that area can be very strong, including large eddies. The currents can go in completely different directions and speeds at specific depths. Debris, depending on its weight and size would be sinking at different rates with currents at various depths affecting it very differently. Needless to say, the deeper the water, more chances of things getting "strewn around" .
The debris field on the bottom of the sea therefore cannot always be an indicator of the sequence of events...
From Deep Submergence Vehicles experience, you can end up with a rover 20-40km away where you dropped it off, and this is with their thrusters at full speed trying to compensate!