Attaching a brief plot of Tomorrowland - I think this has absolute links ... Remember the first letter was said to be written by someone if intelligence - Frank Walker was a boy genius, now cynical about life. The idea that you can change things and make different choices, is fitting here.
The Silence of the Lambs quotes were in the first SG video, responding to the initial ransom note, right?
To me, this signals SG/LE connects the ransom note writer to this “I know who did it” writer.
Maybe proof of life was never sent bc this person isn’t directly involved but has had knowledge of the crime since the beginning. So ransom was never a motive for the perp, but $$ is the motivation for this person with knowledge. Or maybe they played a much lesser role and think they can’t be prosecuted.
MOO