Maybe PG welded the hammer that was found broken near the victim's car. Assuming the victims were still alive during the 8+ mile transport to the burial site - he likely was not the direct cause of either death. Realizing he might otherwise be included among those who actually inflicted the fatal blows - he had a revealing conversation with LE.
I sure hope so.
LE needs better evidence than Cora's daughter's account of a conversation with her mother.
They need real eyewitness / participant testimony, preferably from more than 1 of them.