The burning question is if this flap belonged to MH370.
Let's suppose for a moment that it is from MH370. The next question is where did it come from? I offer the diagram of the Thermohaline Circulation below for your consideration. The red path is a surface current and the blue path is a deep current.
As the diagram shows, the surface current flows past Christmas Island North of Australia and past the West Coast of Reunion Island (between Reunion Island and Madagascar).
I think that is interesting. I anxiously await the analysis of this debris find.