For me, recent case disclosure negates 6 years of red-herrings.
We've had public LE disclosure of:
a) additional video footage of gun-toting abductor from victim's phone where suspect in video pulls a gun and directs victims down the hill towards the murder site.
b) disclosure re: RA's clothing matching gun-toting abductor.
c) cat-hair at crime scene and in RA's backyard DNA is a match.
d) the video'd gun and the bullet at crime scene is an RA match.
e) LE has always stated that the suspect is the man in the video.
We know: Forensics are completed - on the video, the gun, bullet, the suspect, suspect's clothing, victim's clothing, victim's remains, cat hair.
We know: the many years that have lapsed may benefit suspect; eye-witnesses memories will be challenged.
We don't know: the presence of suspect's DNA at crime scene. Or not.
We can assume: Digital forensics - RA's activity on-line, computer memory, phone records - are relevant to the extent they exist. (6 years have elapsed; what's the likelihood digital records from time of crime were recovered?)
Investigation process & forensic results/proofs will be presented at trial.
Investigators will have followed a process, chains of custody, experts, labs, that withstand defense procedural/method attacks (or not).
Investigators' forensics will prove (without a doubt) - that RA is the suspect on the video ... or not.
RA will have a strong defense creating doubt against forensics (and a through d above) ... or he won't.
Jury decides.
Speaking for myself, given the above ... any other theories are a waste of time. Case has been simplified.
The 6 years of red herrings swimming around - now irrelevant.
The 6 years that certain evidentiary items were NOT in LE's possession - a prosecution negative
(in RA's favor). (e.g. RA's clothing, digital records.)
Video/audio analysis matching RA (or not) is critical - the suspect is captured on the victim's video with the gun and the verbal orders to the girls. That along with crime scene bullet and potential DNA matching - is the whole ball game, IMO.
I think cat DNA is interesting. Is it what the case will turn on? I have doubts. But, amusing myself thinking of a cat behavior expert witness on the stand.
(LE suggests there are others linked via a catfish ring - they could become witnesses against RA, but ... if such witnesses are charged as well, having cut cut deals for testimony ... their testimony would add color, add motive - just gravy. The video, gun/bullet, and DNA forensics remains the critical evidence here.)