I believe that Denim will be identified but I also think he'll fall within the category where his family will choose to maintain his anonymity. I know technically we have no right to know his identity but as much as the police assign an officer to his case, it can't be ignored that what they are working with now is due to many other civilians who provided them with a treasure trove of detail.
I don't like to think Denim could be involved in criminal activity and until someone proves me wrong I will continue to think that way. I was on a thread a few days ago where the question was which case stays with you. I still consider the Sumter Does my first and foremost but I don't feel the connection to them like I do Denim. They are more like a puzzle, albeit a mystifying one. (Scrolling through the hundreds and hundreds of missing and disappeared in Argentina has a more visceral effect on me; seeing 14 year old children who were assassinated or umpteen pregnant women). Seeing all the images of Denim smiling or his demeanor when someone takes a pic without him looking at the camera, he radiates a calmness. He may have been on a journey that had nothing to do with hiking.