I've listed a lot of this relatively recently & I always feel like I'm being annoying if I keep repeating a particular set of points, so I'll just say that except for the bodies being found on his property,
all of the "ins" for RL apply to other local men, in varying combinations.
The "outs" = at least 12 probable cause search warrants against other people, several other arrests (both of which indicate RL's arrest was just standard procedure - just like police have REPEATEDLY said), & the existence of many other local men who either have worse criminal histories &/or access to the crime scene.
But most of all, the "outs" list has to include the details in the most recent LE quotes
ie - the FBI issued this request to the general public, not RL's jailers & fellow inmates
"The FBI is asking everyone to take a closer look at the people around you and report any major changes in behavior or appearance over the last several weeks, anything that seems strange, so they can check it out."
& these words from LE, spoken despite the fact that RL is now serving out his probation violation behind bars - for a few years if I read correctly. Why say the following if you know your killer is safely locked in a cell & you have years to tie up the loose ends in your investigation & bring murder charges?
"This person's evil. This person is a monster.
This could happen again. So if you're holding that information (back) for whatever reason, you need to think of that. This could happen to your niece, daughter, cousin, sister. This could happen again.
And that's one of the main reasons why I lose a lot of sleep, because I don't want this to happen again and I think someone out there has the tip that's the final piece of the puzzle."
Link for both quotes :
http://www.theindychannel.com/longform/delphi-the-investigation
At this stage I think it's probable that RL isn't involved. Logically speaking there's certainly no more (publicly released) evidence pointing at him than the few other (publicly released) names the police have shown an interest in.
It's a small town, so it's entirely possible that when the piece of filth is arrested, RL could discover, (like many others will) that he knows the killer. But I think it's going to be a matter of hindsight. I don't think he has a clue who it is right now. He seemed to me to be genuinely upset by the loss of young life, even if his language was befuddled.
Unfortunately for RL, I think there are some people out there who are so invested in believing he's responsible, that even if someone else is arrested, they'll still insist he's somehow involved.