He was seen in the background....
I am not going to jump to judgment too fast. I am going to take LE at their word they phrased it, that he may have some information regarding the exploitation of a child. Not necessarily that he is the one doing the exploiting.
I could be wrong, but if you look at the guy, well, he doesn't look all there. The look on his face does not strike me as a look that rivals anything resembling sexual arousal or even sexual interest. I think he may be involved in this, not as a pedophile or an active abuse participant, but as someone that is stuck in the same horrible situation as the girl. He just looks...victimized. And I could very well be wrong.
He still needs to be identified, so that the girl and the person taking the pictures can be located, but, something about this guy....he just seems hurt himself, somehow.