Yeah, apparently Logan was just supposed to be a guest role for the pilot. Jason Dohring went in to audition for Duncan but played it way too dark, and they were like, "Let us direct you to this asshole over here..."

(Also, Teddy Dunn initially auditioned for Logan before being cast as Duncan. Can you imagine if they'd switched roles?? We could all be Veronica/Duncan shippers! :-O)