Greenwood and Anthony has been amazing in their respective teams and I think they can help Ruben Amorim to improve the performance of his team if they are brought back to the team.
I don't know, but maybe for Anthony, Amorim won't need him. Besides, Betis also seems to have an interest in buying him. Amorim might be more interested in bringing in some new players.
Players who are loaned to other clubs allow them to play better with competition at the club and competitions with different pressures. Amorim will be under pressure to improve United's performance next season, he might consider that, but he will see the needs of his team.
There is a rumor that Real Betis wants Anthony for another season, I also heard that the club is asking United to let them sign the player but Amorim is yet to speak up because may be he wants Anthony back to his team to help the team now that he's going to be under pressure next season.
There has been cases where players are sent on loan and after 1 season with the club they go back to their club because the 1 season loan helped them to improve in their performance.
For now, I think Amorim just want to win the Europa League competition before knowing his next plans but if Tottenham defeats United on the finals I don't think Amorim will continue as the manager of Manchester United for next season.