It's a very big shame that onana has finally lose all the trust he has in this Manchester united team, how can a top class player like him be this error prone during his stay at Manchester united?
In as much as am feeling bad that he is about leaving the club, but he has no one to blame because his destiny was in his hands but he threw it away by his terrible performance in front of goal at Manchester united, the best thing he can do for himself is to just accept this offer and move on because playing as a third choice goalkeeper at Manchester united will be too shameful to him as a player and a person, so it would be understandable if he accept this offer and move on.
This is the time for Onana to show if he's a great or bad player.
He must able to perform in Turkish league because people will watch his performance as we know we see many ex-Manchester United players usually perform in other leagues. Trabzonspor was known for having a good goalkeeper named Ugurcan Cakir which has been purchased by Galatasaray with 4x times amount higher than his market value. So, the fans also have a big expectation with Onana.