Ruben Amorim arrived just before the transfer window was available and it seems he has had enough time to evaluate and decide who will be kicked out because I think there must be some of the people that Ten Hag chose who are not in line with Amorim. If Amorim wants to sign new players, it is obvious that he will have to release some players because it seems that the Board will not give him much budget, as at the start of the season Ten Hag has spent a lot of money.
I partially agree with you. You may be right on Ruben Amorim arrival just before the transfer window but I don't think you are right about him having enough time to evaluate and decide who will stay or leave the club. The next transfer window is in January, I doubt Ruben amorim will be able to evaluate everyone in the squad in such a short time. Right now everybody will want to be in his good books and will play very well so this will make it difficult for him to access the whole players to be able to know how he will reshuffle his squad. I know Ruben Amorim has the technical ability to achieve success at Manchester United but I don't it will be sudden.
At least he will try to start with only what he knows, that's what he said when some media crews asked him. while observing, maybe he has studied at least the performance of the Red Devil players. which players he will keep, and which players are likely to be released. but I agree with you @Pokapoka, that Amorim at least needs time to evaluate and decide which players will stay.
IMO, his initial task at this time, how to make the system he implements can be understood and accepted by the players from Manchester United. I'm sure before Amorim handles Manchester United directly, at least he has some ideas with his observations and experiences so far. like coaches in general, he will give time for United players to perform optimally. if some of them do not show good performance, Amorim will definitely give playing minutes to other players. previously I also said in another thread, that Amorim has technical abilities, that's why he was linked with several big clubs not just Manchester United. but how Manchester United's performance under Ruben Amorim's guidance we don't know yet, especially Amorim and the United players first reach a match to find good chemistry. maybe with that, the probability of United being much better under Amorin is getting higher. well, whether he is able to show it in the shortest possible time, we will know later. at least, maybe Amorin will try to bring United how to qualify for the next phase in this competition. whether or not we are able, we will know later.