im sorry but this is something ive never understood, when were those events wiped from the time line?Is there anyone else who reckons that doing away with such past events as the Dalek invasion in The Stolen Earth/Journey's End, and the Cybermen in Victorian London in The Next Doctor, is a bad move?
In "Victory of the Daleks," Amy had no memory of the Daleks, or of the 26 planets in the sky. In "Flesh and Stone," when the Doctor learned the crack completely erased whatever it touched from the past, he theorized that this, as well as the fact that no one ever remembered the events of "The Next Doctor" (which he commented on in that episode!) were a result of the cracks. He never proved it, though, and even if it did, the cracks could've erased anything to alter those events. A crack could've eaten the Lost Moon of Poosh, and the balance of the Reality Bomb was different so Davros couldn't use Earth as part of the amplifier any more. A crack could've swallowed the hulk of the Cyberking out of the Time Vortex and that's why no one wrote anything down about the giant robot.
It's folly to assume the only possible way Earth's part in "Journey's End" could've unhappened was if Davros and the Daleks didn't exist at all.
So... could that mean that the crack was formed by three inverse tachyon beams fired from three different ships in three different time periods?