Like i see alaric, josie and lizzie getting out. I think sebastian and the other students will get out. Kai is a bit of a toss up
But apart from people escaping this cage, i still feel certain aspects of the prison world hasnt been tapped into yet, it literally copies every object of earth into another earth meaning anything that is no longer on the main earth, they have another chance to get it back
Which also includes the 3 keys to malivore so i feel like this is too great of an opportunity to pass up. Granted idk who would get malivores keys, he doesnt have followers anymore it seems but im just saying that opportunity exists. As well as any other supernatural object from that timeline has been copied over.