Yea, you are actually right, and I think you have said all, I keep saying this, at this point I don't think the problem of Manchester united is the manager, anyone in charge of this club will struggle because of the poor quality of players at the club, though I saw some improvement from this Manchester united team which am going to say that it's the effect of Amorin on the team, but the quality of players and the type's of players that suits into his playing system is what he will be seeking to acquire in the summer because with this current crop of players at the club, I don't sees them achieving anything significant in the nearest future, though they can still move up the table a little bit but challenging for the title in the nearest future with this low quality players is just too much to ask from him.
So just as you have rightfully said, till he sign his own ideal players, he wouldn't be able to get what he actually wanted at Manchester united, because they aren't good enough to compete with the very best.