I think it is very possible the man walking in the video is the perp, but we don't know for sure yet that he is, so I'm trying to think of other reasons he may not have come forward when they wanted to talk to him. Perhaps he has been in trouble with the law for other reasons or was walking that way coming from/heading to something else he shouldn't be involved in. He may just be leery of going into the station and talking to cops. Another possibility is that he did see something that morning when Hania was abducted, perhaps as the car drove out of the mobile home park, but does not want to get involved or say anything. And I guess a third option is that he really has no idea the cops are even trying to find him, but that is lowest on my list. A last option I suppose would be that he is totally innocent and didn't see anything, but just doesn't want to go in. There are some people who just don't like cops or want to get involved in any way.
It is suspicious that he was seen walking right near the scene of the crime right before it happened and he could very likely be the perp, but I just wanted to try and brainstorm other possibilities because we don't know for sure right now. And I would be very interested to see that same camera view at that same time of day in the days leading up to and after this crime to see if he is on there (as in, this was a routine thing he did every morning or not).