I would like to end a theory.
Remember that Ethiopian Airline Flight 961 than ran out of fuel and ditched in the sea:
Ethiopian Airline Flight 961 Remember the pilot who successfully ditched a plane in the Hudson river a few years back? the plane was intact.
Now a video showing how difficult it is to search for the plane in the Indian Ocean watch the first minute:
Searching the Indian Ocean So that rules out the landed safely on water theory
Can you imagine rear ending out of a crashed plane to see the size of those waves
I just hope death came fast and painless from the impact for the passengers...