Android 17, as we all know that he helped the whole Universe 7, Tournament of Power in Dragon Ball Super. He was also the winner of the tournament but the question is that "How is he still alive?" In, Android Saga in DBZ, Android 17 was eaten by Cell and was disappeared in the DBZ, but, got revealed again in DBS as with a job of forest ranger. So, many people thinks that Android 17 had been revived by Dragon Balls, but, no. He was not revived because, if he was revived then, Android 16 would also revived and one more time, in DBS, he was knocked out from the ring by an opponent and, yeah, I forgot his name. And got back, at the last moment, when, Goku broke the limits of Ultra Instinct, and, became weaker. So, if anyone have any theory or any kind of suitable answer, so, please comment it down.