Lots of Fans would've really love Van Nistelrooy to assist Amorin especially after the proved how capable he is if given a chance to coach the team, atleast he'll help Amorin to build a good relationship with the players based on the respect most of the senior team players got for him but come to think of it, their can't be two captains in one ship and Amorin would need full controversy of his squad and do things his own way instead, Ruud Van Nistelrooy had to leave for Amorin to implement his own philosophy to the squad and I believe that's why he brought his own coaching staff with him I think about 4 to 5 of them from Sporting Lisbon. From a clip I saw on the media yesterday when Amorin arrived at Carrington, I think he's already met some senior players that's away from international duties and he's already building a good relationship with them, Ruud is a good coach he really tried for Manchester United both as player and coach, I wish him the best and I hope he's successful wherever he goes to.
nevertheless he only stayed for a couple of games, maybe it would have made sense to put him in as head coach instead of interim coach, maybe something would have worked out, but the management apparently decided not to experiment any more and appoint someone they are confident in. It's for the best, especially if the team starts to show results