I am repeating myself here, but IMHO Fredo could have never "come clean" because by doing so he would have had to reveal he knew it was going to be a hit, and that it was he who let Manolo in to open the drapes.
In a deleted scene, Fredo is seen talking to Manolo and pointing toward the house. It's not clear if it was Fredo or Manolo who was asking about gettingin.
"Generosity. That was my first mistake." "Experience must be our only guide; reason may mislead us." "Instagram is Twitter for people who can't read."
