Here are a few reasons why Duncan should dump Courtney and go with Gwen. First off, as the series progresses, you come to relise that Duncan can't stand Courtney and that he is becoming madami fond of Gwen. segundo of all, Gwen and Duncan have madami in common. And third of all, Gwen doesn't seem to have any problem with Duncans Personality.
That is the whole reason I figured this couple will work.