Onana had many opportunities to prove that he is ready to play for Manchester United, but it is obvious that he is not a very high level player and the worst thing is that he cannot progress, and some good matches are followed by matches where he makes very gross mistakes and this happens constantly. Manchester United needs a better goalkeeper, let them try how they will do with a new goalkeeper, the most important thing is that they do not delay too long if Lammens can't play well.
What you said here are very true, onana was given quite a lot of time to show that he is capable to be the undisputed number one goalkeeper of Manchester united, but he blew it up by making too much errors that mostly leads to goal, and you know the funny thing about it? He can play a complete three games without making a terrible error that leads to goal, so he has no one to blame if Manchester united decides to cash him out, just that they took too long in doing so, just as you have said already, if this current number one goalkeeper of Manchester united fails to cash up fast, he should be replaced without delay, than wasting more time
which willthat might prove costly by taking a bit longer
than expected.