I've tried to assess the trajectory angle of the piece that exited through the top of the wing and I reckon it is about +45 degrees to the horizontal; this would obviously take it over the fuselage to starboard of the track. So if the "120" theory is correct then the piece they have found would have come off in a horizontal or even below direction (to port of track as we know). To me this would not be at a sufficient elevation to have travelled the distance calculated - or it was travelling even faster! Of course the aircraft's altitude is a factor, but I can't find a mention of it. Perhaps around 7000'?