We are updating the quest DLC today (its the 2nd update since we released it). We treat it the same regardless of if it is DLC or not.
As for the Giant Skeleton, not all of the unique monsters were supposed to have unique treasure associated with them. Cnotta doesn't either. But I did notice that I set Cnotta to drop a rare item when he was killed. So I'll switch the Giant Skeleton to do the same.