The more I think about this theory, the more likely it seems.
I have an old theory regarding The Whispers, it’s old and not terribly exciting. After the last two episodes I want to create a new theory about The Whispers. I now believe that The Whispers are the group of time travelling Oceanic survivors and co. Daniel says that they will fail if they try to communicate with themselves or people that they know, perhaps The Whispers is them trying. Or maybe it’s not them, but it’s other people in the same time travelling loop.
Anywho, I’m going to write this up on my theories page soon, hopefully it will make more sense there. Stay tuned.