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Despite Oz's flashback and what happened to his siblings and Mother, I think it shows what a psychopath he is; it's like seeing a justification in how every villain Batman must face has a twisted mind and why he is always included in Arkham.

Oz is an opportunistic, manipulative, vile and ruthless killer, always needing to be recognized, especially by his mother and despite having some theory about what happens in the end, I have no doubt the control of a shattered city he will have and finally be worthy of capturing the attention of the Dark Knight.