In football, a player that play brilliantly with a team, might be totally the opposite with another club. Onana isn't the exception but he managed to find some stability in Manchester United comparing to his old mate Maguire where you find infinite compilation about his fatal mistakes.. Onana might not continue for a long time with Manchester United in my opinion and he deserves to get another chance in another reputable club if this happens one day.
Meanwhile, Manchester City was surprised by the defeat against Manchester United in the end of the game and Guardiola will have health issues after these catastrophic failures this season!
It's not a good move for player when he is been replace by someone the public think was better. I mean everyone in Manchester United were angry how De Gea was replace by Onana and they were patiently waiting of his mistakes instead of supporting him to do better. All his memes were all over the social media, I'm not sure he was ridicule like Maguire was ridicule that's why ETH never mind what the public was saying, he knew their plan but continue with him.
It was the same plot they wanted for Maguire, his mistake was more like mental issues and the public wereny helping the situations but you can't let the public win in that situation, you let him be until he is able to level up back to his fit which he did. I remember he score a goal that period and everywre went silent, this is how you show support to the teams but all that's in the pass, the new coach need new believers among the team.