Eli sees himself in Bevan, which is why he wonders if Bevan has a brother like August or a mentor like Slim. Mentioning the repeating cycles suggests that Eli fears that the drug trade in the suburbs will hurt Bevan, just like Eli was hurt when he lost Lyle, Mum went to jail, and Iwan cut his finger off. So, it may seem like Eli is approaching the crime desk out of curiosity and because he’s obsessed with crime writing, especially given Dave’s response. But Eli is really stepping up because he feels responsible to Bevan.