The Sauniere Mysteries: The Priest Exonerated?

The ritual murder at the beginning of “The Da Vinci Code” was based on a similar case that occurred near Rennes-le-Chateau in Coustaussa that has remained unsolved. The source of the funding behind the Rennes-le-Chateau mansion and other building projects is still a mystery as well. Is there a connection between there two enigmas?