A player will join a big and tough team, Manchester United only a big team, so Mitoma should be in Manchester City.
It's so hard to understand what happened to players in some season. He was very cherish in Seria A last season before his departure for Manchester United. In all of the 38 weeks, he conceded 42 goals and David De Gea conceded 43, Inter came third in Seria A and Manchester United came third as well, you see that despise the chantings, De Gea is not too better than him but considering his age, Onana is in better place to perform better for Manchester United.
The worry here is that he has conceded more goals in just 7 weeks, if he is able to concede that amount now with this performance, he has more 31 goals before the season to concede and that will not lead Manchester United to any where. However, since he is considering for not going back for Africa cup of nation, he is going to focus on Manchester United to liberate them from this weekly humiliations.