Hiding in plain sight is a well known reference to pedophiles. Whenever someone says that it is what I immediately think of. They are even known to have forum topics dedicated to this on the dark web.
That’s why I also think it was sexually motivated. I think the PC was totally playing at the killer, every single sentence.
I 100% agree with your last sentence, but not the first part of your post.
Lusting after 13-14 year old girls doesn't make someone a pedophile, it's not ok if you're an adult, yes, but don't mix it up with lusting after prepubescents and little toddlers.
Anyway, I think "hiding in plain sight" meant just that. People of Delphi don't recognize him because they haven't seen him in casual clothing before. He wears a uniform or overalls whenever they see him, and they've never seen him with his hands in his pockets because he's always carrying tools or he's working with them, electrician, mechanic, etc, even a preacher use their hands more than BG. He might be the most upstanding citizen of Delphi, super-loved and always there for anyone in need. But no one has ever seen him out of that image. They don't recognize his walk because in the video he's walking on a wobbly broken bridge where he has to watch each step, they don't recognize his voice because when he's at work he's not in psycho stalker mode.
I still think LE finally went the DNA-route (Parabon/GEDmatch etc,) just haven't been able to pinpoint WHO, out of three, nine, twenty-five. The PC was way too detailed. They know his family, imo.
I also believe he has been in contact with LE, that he left signs at the scene and possibly has sent them letters since.
imo, jmo, etc.