There is another picture said to be Billy the Kid, Bat Masterson, Jessie James, and Charlie Bowdrie standing together which was taken in Las Vegas, New Mexico in 1879. Obviously, the picture is controversial, but the men in the photo do bear a striking resemblance to those historical figures, however unlikely their meeting may have been.
See below:
http://theellisoncollection.com/gallery.php?gid=85