You got me there. Wish there was a way to ask them.
[And now his brain is getting into this too much. What if the other thems were brought to the prison for doing something deemed wrong? They couldn't be infallible, right? Nobody was perfect. Hmmm. He heard there were other versions of the same people here. What if one of them was a doppelganger and didn't even know it? There probably wasn't an easy to way to tell.]