@naMnaSYt Perhaps Aang often mentioned what he would do if Bumi or Kya were there, leading Tenzing to mistakenly believe that they were also present at the time.
@UrbaneUrban it is a fact that iroh participated in the war. The Hundred Years' War had only recently ended; some had emerged from its shadow, while others had not. Similarly, some were willing to accept iroh's atonement, while others were not. These two perspectives are not contradictory.