They couldn't have both used the same Lazarus pit since a pit is rendered powerless once its powers have been tapped . . . right? That means that either 2 pits were defiled or that Tommy Elliot did some massive reconstructive surgery on Harold. Although that doesn't account for him curing the muteness. Exactly how many Lazarus pits are there? I'm going to stick up for the cancer bit bringing Riddler and Tommy together. It opens the door to a partnership between them. It gives them something in common, a flicker of instant kinship because they've been touched by the same affliction (directly, indirectly, it doesn't matter). The only thing that makes me uncomfortable about it is Tommy's attitude towards his mother. If he really saw her as an obstacle to money, he shouldn't really care about her having cancer and then it can't serve as a mutual tie. Then again, all Riddler would have needed was a foot in the door and Tommy might've agreed to a meeting since the person who could cure cancer would end up being a very rich man. That, of course, depends on Tommy's motivation being purely monetary at first. And it roots their motivations into something that isn't exotic, which is what I like about it in the first place. World dominance, immortality, etc. are all well and good but there's something refreshing in glimpsing evils that we all can feel lurking within us or feel around us. Greed and revenge, selfishness and superiority. Old friends, eh?