If the killer of these girls had had intercourse with them/one of them, there would be DNA evidence... which could be matched against any potential perp, who would then be dismissed as a POI, or arrested. jmo. This doesn't seem to be happening. Too bad we don't have more details from LE. (Personally, I believe that if the girls had been 'raped', LE would have said so. What advantage is there to NOT saying so? If raped, and they said so, then (imo) the public would be that much MORE enraged about what happened to these girls, and perhaps that might lead to more tips being called in from people who weren't sure about someone they knew being a potential POI, but a possibility... so why NOT tell people they were raped, if they were?). Also, the way that LE has responded to the 'was there DNA at the crimescene question', leads me to believe they have various DNA, but not necessarily sure whether they have the perp's DNA.
In regard to DN... considering that he has a history of publicly exposing himself, and a reported history of becoming quick to 'rage'/temper.. it doesn't strike me as far-fetched that he may expose himself while out on the trails. Even in my small city, there are numerous incidents reported in the news each year in regard to whackjobs exposing themselves, and/or pleasuring themselves, in public (usually seen/reported by people walking/running/biking... and those whackjobs are not necessarily ever identified).
And to go one step further, if exposing himself were met with taunting, ridicule, laughter, name-calling, and/or insults, it wouldn't be a leap to imagine a perp becoming enraged that his tactics were met with ridicule as opposed to shock. And especially if his personal life situation at the time was putting him under a lot of stress (homelessness, another child to support on the way, no job, no money, possibly putdowns from someone close to him for failing to provide, possibly stressors in regard to a missing brother?, whatever). And especially if a perp may have been ridiculed by others throughout his lifetime.
Then months later.. we discover that CO police, for whatever reasons that they are aware of (and we are not privy to), believed there were similarities between the CO cyclist murder and the Delphi murders - enough to contact IN police and also report it to news reporters, although that is as much as we know, since IN police immediately shut it down by asking CO LE to say nothing about their case.
Lo and behold, DN is caught on camera in a vehicle recognizable by plates, after acting suspiciously during a search for the murdered cyclist.. and turns out he was also in IN at the time of the Delphi murders.. and apparently he has no alibi. Police aren't able to exclude him as a potential suspect. Sounds like a bit of circumstantial evidence there so far, but not enough yet for charges.. I just don't think the girls were raped (for reasons outlined above).. and my guess is that DN was feeling stressed and angry as opposed to looking to fulfill sexual needs. jmo!!!!!!!!