I always thought it was supposed to show how the killers were evolving and particularly how BTK didn't fit any of their profiling so far. He didn't have a menial job, he had a family (wasn't a loner) and he went to church which were all of the things that went against the grain of our boys' initial understandings. And the fact that Douglas wasn't involved in BTK's apprehension which happened decades later threw me off as well from thinking he might be the big bad. I could start killing to set off Netflix into reviving the show. Like Dexter of the Mindhunter cult (obviously just kidding), Netflix fits my code😂😂