User blog comment:ArtDraw12/TD Theories: Who May Return in Potential Future Seasons?/@comment-4742462-20161006213245/@comment-11883116-20161006223823

Well, Duncan will most likely return because:
 * Love triangle (as it's implied he still cares about Courtney) between him, Courtney, and Scott wasn't used. He only mentioned in one confessional he thinks Courtney is just using Scott to make him jealous. That's it. But if he watched the season, he should know it was true feeling, so they should show his reaction to it now.
 * He's the only male to compete in all TD seasons of the 1st gen.
 * He's creators' pet and a lot of fans still love him, even after TDWT and TDAS.