All are juvenile Hobbies. Note the broad moustachials, lack of stunningly white ear coverts, lack of pure white ground colour to the underparts, and rather uniform underwing (lacking a darker trailing edge and black and white barring).
http://orientalbirdimages.org/se ... _ID=&pagesize=1
I find Amurs strikingly monchrome with even at long distances shining white ear coverts. They also are often a little more compact, sometimes even recalling Peregrine in proportions and stockiness.
The bulging chest in the photo appears to be due the bird having eaten recently, and the alula is apparent due to the posture of the bird in the photo.
