I watched JVM and one important point made was that RC doesn't want to be connected with the Anthonys in any way. One of the guests elaborated, saying that Haleigh was a missing child and neither parent is suspected of harming her, while Caylee Anthony is a murdered child (never missing), and her mother is charged with first degree murder in Caylee's death.
The Cummings family doesn't want anyone thinking there's a similarity between the two cases, and no connection between a missing child and a murdered child.
The guest also said that other missing persons groups don't want any affiliation with the Anthonys.