I think soemthing is a bit messed up if you don't tell directly the mayor that big bret send you, because I don't have the closure dialogue with big bret, even after I fininshed the burrower and rathound king quests.
Big bret only has the "About Hartor . . ." dialogue tree as if I never be at Hartor. I can't tell him that I have resolve their troubles and that Hartor is fine.