User blog comment:PurplePenguin/The Grunkle Stan Mystery/@comment-107.8.153.181-20130511131346/@comment-50.142.113.190-20130523233230

I think that stan (Stanford) has a brother (Stanley) who wrote the books when he was in gravity falls. But,one day Stanley either died or disappeared. I think the whisper "I am still here" is Stanley, who knows the truth about his brother, grunkle Stan.