I have to say SonataArctica (the poster here at the top) has the best interpretation i can think of.

my thoughts about the end are:

Number 9 drinks poison that the father figure gives. He knew the drink was poison, so he acted like he died or something.

9 survived. he starts a "new" life, instead of stealing lives, he becomes a theif/pickpocket.

Does that make any sort of sense?