Quinn definitely feels like a Doakes redux, except that Quinn doesn't seem to be nearly the opponent that Doakes was. Plus, Doakes had some dark secrets of his own, so his obsession with Dexter (and being able to tell that something isn't right with him) made a lot more sense. Quinn just seems like a bumblefuck and would be a letdown as an opponent given the likes of Doakes, Lundy, Miguel, Dexter's brother...