Odyssey was originally supposed to be a trilogy. It was in the first one because it obviously was supposed to be in the original to introduce them. The second one never got off the ground, but I made up for it for introducing this third one later in time. These three (ended up being two) were supposed to be the tales of the Gold Tribe. That was their main story being told. I planned it out so that the end of this one would have a conclusion to the tale of the Gold Tribe, to whatever end that will be. I decided I would end it at that, and bring it up no more.
Then you came and asked if you could continue Odyssey. I agreed, but I told you specifically that yours would be a spin-off, an extension of the original tale, not necessarily a third part in the trilogy. An extension has everything new. A new tale. New characters, and new factions.
Think of it like bringing something back that might be overused. I planned out a pretty solid ending to this, in a way that would bring the Gold Tribe's tale to a satisfying conclusion. I wouldn't really want them to be used again after this.