They have DNA in Erica's case ,it has not been matched with anyone and was ran in 2012. I agree it sounds like a crime RAT would have committed ,I believe the unmatched DNA points away from RAT. Unless he plants DNA evidence, in which it might sound crazy but I believe he would. However I dont think he is Erica's murderer.
I thought I would sleep better ,after RAT was convicted, I was so on edge about the thought of him getting away with his twisted crimes ,that I felt sick. However I did not sleep better, I keep thinking about Samantha and Alexis's and how Alexis fought with him ,yet it turned out to be so she could save the next girl that surely would have become RAT's victim.
I reread Samantha's thread last night ,it isnt very long and there is a theme in the post about no release of any information. What information did they have that might have saved Alexis?