Interesting. I didn't know these neighbors names - still don't just the initials you gave. So, where can I find out their names? You said one lived on the corner, where does the other live?
I think it was a combination of things, believe it or not, I think PI work. With the things they probably overheard (since Baez is concerned), the videos of KC in jail, interviewing friends, neighbors, code speak, etc.
But I think they were there videotaping with the hopes that they would find her and have it on tape and would make a fortune off of it. And the "fame". I don't think they were taping to show anyone to be directed further, just pure self-centered greed.