So who was the original Clovehitch Killer? (spoilers)
The dad or the uncle?
The murder did stop for 10 years after the uncle got into a car accident.
Was the dad telling the truth about the photos belonging to his brother? Did he only use them as his own twisted porn stash for 10 years until he was forced to burn it all?
That would explain why before attacking anyone, he did try to recreate the photos while posing himself as the victim.
Seeing how that didn't work at all, he reluctantly attacked a woman in order to restart a photo collection. Notice how he's not enjoying himself at all while all of this is happening. It seems like a chore.
The only evidence of the dad being the one and only Clovehitch killer is that he seemed to have a tried-and-true pitch about being a bank robber in order to calm his victim down before she could be fulled tied and gagged.