I quite agree with the 4 players who will be sold because apart from their age, they are now starting to be no longer relevant to the attractive game that Amorim wants to bring. Rashford performance is also not too prominent but Onana can still be negotiated because he only needs motivation and is given high trust by Amorim. With the results of the player sales that if successful, Man United has the opportunity to improve several vulnerable positions.
Onana can't become a stable goalkeeper, which is very important for any team that wants to achieve great results, I think that Manchester United should have a goalkeeper of a much higher level, because when in some games the goals conceded are the goalkeeper's fault, then this problem needs to be solved, and it should have been solved a long time ago, long before Amorim arrived. This is not the only problem of the team, and often there are even more of them than there were, I think to make Manchester United great again, a lot of changes need to be made.
Onana is a good goalkeeper, but I agree that his performances are not so consistent that it makes Manchester United's defense easy to penetrate sometimes. To bring in a new goalkeeper, of course they have to sell their main goalkeeper, unless they will make one of them as a second cover. However, usually when a team brings in a new goalkeeper, they have to sacrifice their main goalkeeper to be sold or loaned. But this is also not something that can be guaranteed to be successful, I mean sometimes a change does not bring anything better. The point is they have to be very selective when they want to bring in new players.
Onana is good goalkeeper only when he was playing at Inter Milan and Ajax but for Manchester United Onana performance is dissapointing and he is too often to make blunder which sometimes makes Manchester United failed to beat their opponents but until now Amorim never discuss about new goalkeeper as the replacement of Onana so i assume Onana position as Manchester United first goalkeeper is still safe and as far i know Amorim currently more focus to look for new left back or new striker because Amorim feel these positions is the weaknesses of Manchester United