Two things:
One, it is also possible IMO, that RL was set up, especially, if it turns out the victims had been murdered ( COD would include intentional drowning..) elsewhere (which we do not know) and were dumped on RL's property after the fact.
But then..
Two, is it just me or has somebody else noticed, that RL seems so surprised not so much or only about the bodies and the fact of foul play, but very much about how the victims got to that location? He says repeatedly in his interviews, that the victims either walked there on their own, or that someone else led them there, because he thinks it is difficult to walk of a terrain and therefore difficult to carry someone. That is an odd comment IMO. It almost sounds like " they really should not be here on my property..they died somewhere else..".
I never doubted the possibility, that the victims had walked there themselves. So, why mentioning it? I would only be worried and heartbroken about what happened to the girls no matter when and where it had happened, or if they walked there on their own, or if someone led them there.
All IMO-Nin