By Grey Whitebloom Real Madrid’s former sporting director Jorge Valdano once told the club’s demanding president Florentino Perez that, on average, three out of every five transfers are failures. That pessimism is not shared by the large proportion of football fans that fetishise transfers above the actual game. To convey the balance of perceived importance, the self-styled transfer expert Fabrizio Romano has more social media followers than Manchester City, the best club team on the planet. Transfer fever reaches its febrile peak on each deadline day. Here’s what would make for an enthralling…