I love the olympics, whenever they are on I retire from the world and watch all I can. Rio 2016 has been the games I have watched the best so far.
From your list Almaz Ayana victory was outstanding, she crushed her competitors and the record in a way that I could not believe, she would get my vote.
Of course there are many moments that can be included in a poll, as was my actually favorite moment, Mexican athlete Ismael Rodríguez becoming the first Latin American to win a bronze medal in Modern Pentathlon. His face at that moment was incredibly happy, and also increduluos at his surprise medal, he made an enormous effort and he was incredibly happy at the medal ceremony jumping and dancing.
Shamefully only I would vote for him, it is a little seen sport, and an athlete that no one talked about outside my country. Even here, almost no one watched his moment of glory, 9 tv station were showing the final match of Brazil in soccer instead of his sport, because many did not even knew he was in the final, and even those who knew did not believe he had a chance.