The story behind this photo is that the previous evening's competition ran very late. the champs were asked to congregate for a photography session early the next morning. Arnold, to say the least, was not feeling very 'perky', and kind of 'hid' in the back landscape (agreed...very much unlike Arnold).
So Ricky (of very fine physique) stood out even more.
Mike
PS: This story can be found in Weider's 'Brothers of Iron'
Mike