nobody suggested it will make any player better. yes, it's one of the sillier aspects of football but from what i can see users are just discussing who will get #10 #8 etc.
http://www.mirror.co.uk/sport/football/transfer-news/manchester-united-william-carvalho-deal-3273687#.Uy5EWzqKGuo.twitter 37m is a lot of money for a DM
he is a safe keeper. he has botched some saves - vs Reading last season for example but those are extremely rare. also, it helps he has this robotic calmness about him.