How did Bonnie get the cure in the 1994 prison world for Elena if Silas was there. Silas had to feed on Jeremy in season 4 and the only way to get the cure is to wake Silas does that mean Silas is running around in the 1994 prison world?
It copied the world during the time. So technically the only living things there would be anyone who was sent there and got trapped there. The cure exists but Silas doesn't so Kai couldn't have any power