I don't think RL is the most likely suspect here, but to answer your question, if he is somehow found to have been connected, then the complexity could be several fold.
It would be complex if there was some evidence RL was involved, for ex, but his DNA wasn't found on the bodies.
It might be complex if only transfer DNA from RL was on the bodies because that wouldn't prove he killed them even if he did.
It might be complex if there was multiple sources of DNA on the bodies.
It would be complex because he has an apparent alibi for the likely time of death, so that would complicate trying to convict him.
It would be complex to develop evidence to convince a judge or jury he was capable at his age of the physical demands assumed to be part of killing two people.
Even in other cases where bodies are found buried in yards of the killer, LE still has to build an airtight case so prosecutors can't put reasonable doubt out there that someone else just dumped them there.
I think this case is complex no matter how you cut it, IMHO. If not, I think LE would have more right now than they do.
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