I actually have an extremely small theory about the beings behind the weeping angels. I believe they might actually be time lords. If you watch the episodes when “The Master” comes back, and get to where you are seeing them speak, they mention the council men that did not agree with them to go back, were referred to at the “Weeping angels”, and as they came out of the gate you saw 2 of them having their faces covered like the original weeping angels. Now, they mention that the time lords are in a time lock correct? Well that’s true, but as long as something that was there before the time lock came into effect and managed to remain outside of it, then small things could get out. Like if you saw, the doctors mother kept getting out to talk to Donna’s grandfather. But only really as a image. This proves that small bits of them can get out but only as a consciousness. The angels also disappear and reappear into existence, turning into stone as the light comes back on.
I would absolutely love to hear everyone opinions on this. Again it’s only a small theory and it’s not completely put together, but it would be pretty cool to find that the weeping angels really were time lords. Then maybe we feel the doctor wouldn’t be completely alone.