Definitely. 'The Watcher' draws upon the John List story. The plot and characters might have been adapted and fictionalized to some extent, but the core inspiration remains from that story.
In fact, 'The Watcher' has its own unique plot and background that's distinct from the John List story. There are no elements borrowed or related to it.
In the 'the watcher john story', 'the watcher john' is likely a key figure. He might be the protagonist or an important side character. Since we don't have details about the story, he could be named 'the watcher' because he has a habit of observing events, people, or secrets. John could be his name, but it's also possible that it's a code name or a name given to him for a specific reason within the context of the story.
One key event was that John List, in his own deluded state, planned the murders of his family members. He then carried out these heinous acts in their family home. After that, he faked his own death and started a new life elsewhere. Years later, through the efforts of the media and law enforcement, he was identified and apprehended, which was a crucial event in bringing some sort of closure to the case.
The John List story is a disturbing one. He was a man who killed his entire family in their New Jersey home. He meticulously planned it, leaving behind a seemingly normal facade. He then disappeared for a long time. Eventually, he was caught due to the show 'America's Most Wanted' which led to his capture. It's a case that shows how someone can hide their dark side from those around them.
The story of John Graff in 'The Watcher' is likely a combination of truth and creative imagination. It might have some roots in reality but has been adapted and embellished for entertainment purposes.
He could be significant as the central figure. Since he's in the title, he's likely the main character or at least a very important one. Maybe his actions as a watcher drive the plot forward.