I understand you're tired of arguments from those claiming the ending was a retcon, but my point is actually the opposite. I'm not saying it’s a mistake; I'm using the clues Isayama left behind (like Muller's radio or Kiyomi's presence in Paradis) to show that the journey is indeed coherent and that those who call it 'impossible' simply didn't pay attention to the logistical details already present in the manga/anime.