No clue about the likelihood of police using similar facial recognition matches for the rest, but normally the alternates need to be around the same height, build, and complexion as the subject. I would think including multiple potential matches would be a huge no-no simply because your alternates need to be people who you know are not a match. If you just grab the 6 most similar faces and ask the victim to choose, what do you do when they pick the third closest match?

Even worse, the employee who was asked to pick him out of a line up hadn't even witnessed the crime in the first place.