Also, the bodies recovered by the US ship today were reported to be more than 30 miles (confirmed was not kilometres) (source BBC news) away from the other bodies, and some were still strapped to their seats. That seems to suggest a possible mid-air breakup.
While not ruling out the possibility of a mid-air breakup, this discovery would not necessarily provide evidence to support it. In the normal ocean currents over 5-6 days this distance is perfectly plausible for drift in the water.
This is courtesy of NASA and shows the currents for December 2013. 0.5 m/second = approx. 1 nautical mile per hour. While an object will not travel at the same speed as the current, over 96 hours since the crash, 30 miles is possible if the aircraft broke up on impact.