RORRRRRRRRRRYYYYYYYYYYYYYY!
AAAAAAAAAAND he's an Auton. OF COURSE. BUT BUT BUT if he's an Auton created from Amy's memories -- taken from a snapshot on the night she left -- how does he remember everything up to getting eaten by the crack, huh? Theories, I have none.
I am still too O_O to be able to say anything coherent about the rest of the episode, so I'll just say: Auton!Rory/Shalka!Master. THERE I'VE SAID IT. MAKE IT HAPPEN, UNIVERSE.