Before starting work on Manchester United. Nistelrooy was working for PSV and maybe this means Nistelrooy is experienced enough to help Manchester United where he played therefor years. Even he had a good performance as the coach of Macnshter United when they were playing against Newcastle United and maybe that's a good sign to say Nistelrooy could help this team even more than Ten Hag
I think since Nistelrooy is familiar with the team the best they can do is to keep Nistelrooy for a longer time to help Amorim if Amorim agrees. Because Amorim is not familiar with the Premier League at all.
Ruud Van Nisterooy isn't only familiar with the team but as a former Manchester United player who later became their coach and recently the club manager, he perfectly understands the philosophy of the club which is why I think working with Ruben Amorim would've significantly helped to further improve the club performance but the Portuguese manager have refused to work with any of Erik ten Hag's technical staff which means that Ruud Van Nisterooy will be leaving Manchester United. Earlier today, he penned down his farewell message to the club fans and I think it was a very emotional one
There is one thing that you guys don't understand in this case and someone explained it and I had to agree with him.
Check out;
Assuming that you are Manchester city owner, you employ Amorim and Ruud becomes his assistant after an excellent stat as an interim coach.
Then, Amorim lost 6 matches, won 2 and drew 2 in his first 10 matches. What will be your next move?
Sack Amorim and make Ruud the head coach right? Have you seen why Ruud will not assist Amorim. Even if Ruud wishes to, Amorim will not agree.