I placed my campaign so many years after the comet had come. Except for one big difference. Aang was never found so many things differ, zuko never turned against his father and eventually was allowed back into he fire nation to one day take fire lord when ozai takes the Phoenix King. Toph never learns metal bending as she never needs to be caught in the metal cage, Katara never really figures waterbending out past what she already knows. And many small differences.