Even actress A.J. Cook had no idea about her Criminal Minds' departure, and was hurt over being written off abruptly.
As for that aforementioned first thought of ours, it was in the final season of Criminal Minds that the possibility of a JJ and Reid (Matthew Gray Gubler) romance was introduced. Now, do we think ...
That episode ended with JJ accessing the site to see for herself, and while Criminal Minds (thankfully) didn't show any of the content, it was clear enough in "Kingdom of the Blind" that it hit ...