THere are categories of people that have similarities in their facial features -this is why sketch artists are able to build com[osites with witnesses. However, this will only eliminate classes of people, not all people that are in a class that look similar. And sometimes a witnsees will remember one part wrong-they will get the nose or lips or.. wrong. More witnesses are better for making sure that all parts of the face get identified correctly. I do not know how many people were used to make the JD#2 sketch. If only one, then there is greater chance of the sketch not being as accurate as you would want unlless the witness saw the suspect at close range for a period of time or for repeated times.
THe are also two different FBI JD#2 sketches which look different to me.
If we knew the heighth and build of Azmath and Padilla and JD#2 we would be more likely to rule them in or out. I recall that JD#2 was supposed to be muscular, slightly stocky and about 5 feet ten inches tall.
This approach helped me immeasurably with the John DOes seen by the Travelers aide witnesses. All the John DOes at Travelers Aide had the right height and build for my sketch suspects. And in one case I have a color photograph which matched the hair and skin color perfectly with the description of a John DOe by the witness. In another case it is known that a suspect identified by a witness also also had the right eye color (bright blue) as the person or John Doe whose sketch I had.