People who are speculating about the identity of the suspect and leading a communal witch hunt are doing a huge disservice by publicly outing individuals they think may have committed the crime simply because they have a tenuous link to the location/victims and bear a slight resemblance to the suspect pictures, which, aside from the clothing, have no readily identifiable features. These types of posts are per se defamatory and could lead to legal action.
While I agree that the geocache angle must be considered by the police, it's highly unlikely it had anything to do with the crime. One need only to do a cursory internet search to discover that bodies are found by geocaching sites all the time.
https://www.geocaching.com/bookmarks/view.aspx?guid=20721106-6937-40df-986b-4f441ce0b7ba