GTA V - Infinity Killer Murder Mystery

A newspaper clipping found in Sandy Shores details the death of Merle Abrahams, the only known suspect in the case of 8 missing men:

A riddle on a desert rock:

Some paranoia on a desert rock:

A prison wall riddle which is also referenced in the gathering of Epsilon Tracts (collectibles):

Numerous instances of this barrel are found throughout northern section of the map:

On the outside of an abandoned home in Sandy Shores:

The interior of that house:

Another interior view:

A strange collection of body parts in jars:

Another interior view:

1 of 8 bound and shrink-wrapped dead bodies underwater:

Locations of all underwater dead bodies at northernmost tip of the map:

 

This murder mystery is presumed solved but I wonder about Merle's ties to the Altruist Cult and Epsilon Cult.  The writing styles differ for the riddles and the house graffiti - one believed to be Merle's, and the other, believed to be a pissed off Sandy Shores resident.  Because Merle died in prison while awaiting a fair trial, I wonder if he was actually a government scapegoat for an abduction cover-up.