I'm right there with you. I don't think this case will be solved in the near future. I don't believe LE stopped asking for help b/c they have all the answers, they didn't ask for much help to begin with and have been very quiet from the beginning. I don't think they had a clue the girls were abducted, I don't think they had any idea what happened until their bodies were found.
I am not trying to imply the LE dept is inept but I just don't think they had many clues or looked for the right clues. IMO, they thought the girls drowned and started the investigation with that theory in mind.
I had followed several cases before Jessica Ridgeway, she was the first case I followed where an arrest was made. It was so shocking, I didn't even know what happened after an arrest was made b/c all of the cases I'd followed weren't solved. To me Lyric & Elizabeth is another unsolved case.
Interesting info here...
http://projects.scrippsnews.com/story/child-dies-every-day-unsolved-homicide/
Police report they don't know who committed more than 10,700 killings of children from 1980 through 2008. Of the 51,753 murders of juveniles 17 or younger,
nearly 21 percent were unsolved.