I remember that "theory."
I remember an interview, maybe the first one they gave. John Ramsey said [paraphrase] "I just buried one daughter and people think I would put myself through that again?"
It broke my heart and there was no way he could have faked what I saw in him. I knew if he thought Patsy had anything to do with it, they would not be sitting there together.
No idea if any of this has any validity, but here goes . . .
Sex offender registry and picture of Charles Lawrence Carr (alias John Mark Carr) at the link:
http://www.shadowraiths.net/?p=73