Okay, but this is a big space rock that being the case why can't a peice break off and hurl at earth?
Even if a piece broke off on its own, it would more than likely follow the laws of physics and travel along with the main asteroid, same path and speed, like an astronaut stepping outside the space station. It would take tremendous force to alter even a small piece of Toutatis to a course toward earth at this point.
It would take a massive internal force to liberate and re-direct a chuck of rock to hurtle toward Earth. There is no massive force available on that dead rock.