The following is a link to a photo of a juv Pied Harrier.
http://orientalbirdimages.org/bi ... p;Bird_Family_ID=96
Notice the facial pattern: dark throat of Pied c.f. creamy throat of the Mai Po bird. Pale crescent under the eye c.f. dark surround of the Mai Po bird.
Whether the Mai Po bird is Western Marsh Harrier or a Western/Eastern Marsh Harrier hybrid is another matter, however...