Why did the suspect drag Libby 7-8 feet across the crime scene when she was dying, bleeding out, nearly decapitated? Abby had her neck cut and she died on the spot, not so with Libby. Why was she dragged, bleeding on trees and leaves? What was the suspect thinking?
IANAL/LE, but I have suffered from depression anxiety disorder, (which is what RA is alleged to have been suffering from) often debilitating, for 30-odd years.
To me, a lot of RA's actions make so much sense it's creepy.
Let's say he decides to abduct the girls: high anxiety but if that was his sick fantasy, high dopamine. He turns of his phone at some point, everything is happening in the moment, very little planning, just sailing on the adrenaline high. However anxiety wins the moment he gets startled/interrupted. Instant despair "oh world what have I done my life is over!". Lashing out and killing Abby out of despair. Trying to kill Libby, getting more and more enraged because of how bad he's failed even in this (aka it becomes a violent kill).
The girls are dead, anxiety is back - they will know, everyone will know. He tries to drag Libby's body, so he can bury, hide them both. He fails because he is a weak man. Despair is setting in, it's all over isn't it? Maybe some branches will hide them. Tries. It's too difficult, now that the Adrenaline is gone. He gives up, having failed in this too. Did he clean himself up? I doubt it, if you are having an anxiety attack its very hard to commit to and finish even simple tasks.
If my wild hypothesis is correct, I'm sure he is looking deranged and/or scared on his way to his car, which is something I'll be curious to hear more about from the muddy and bloody witness.
Most importantly, the depression/anxiety loop explains to me why he tried to go to LE. It doesn't matter how evil a person is, the anxiety would be telling him - you are going down anyways, better tell them already. I believe that DD says something that makes RA think they really aren't looking into him and that he can get away with it so he never actually confesses back then.
I don't think RA offended since because I don't think he is the kind of killer who actually enjoyed the murders. IMO he enjoyed the control but he had very little of it. I think the girls fought in their own way each, I think they destroyed his sick enjoyment until only panic and despair was left in the sick man who killed them.
That's all MOO. And whoever the perpetrator is, I hope they don't have a moment of peace until they confess/make ammends.
That's also MOO.