Damage analysis
If this is the Flaperon from MH370 then I believe we will end up with a reasonable idea of how the plane entered the water. By looking at the damage to the skin and paint, and the direction at which the material around the mounts were stressed and torn off they should be able to get a idea of the forces it was exposed to. I think at the very least they will be able to decide if the flaperon was extended and an attempted landing was made or the plane made an uncontrolled impact be that vertical or otherwise. I don't think we should underestimate the value of finding just this one piece.