The earnest question of whether Lionel Messi could do it on a cold, wet night in Stoke has persisted as a cliched joke for a few years now. So when Barcelona surprisingly sold Bojan, a 24-year-old once hyped as the next Messi, to Stoke City, the only explanation was that Messi personally asked him to go there on an expedition to see if the conditions in this mythical place are as challenging as the fables suggest. This is Bojan’s fifth letter back to his friend.