While Manchester United’s glorious FA Cup triumph over bitter rivals Man City gave us a reason to look back with some fondness a largely disastrous season, it also had us wondering what might have been. What might have been had Erik ten Hag introduced Sofyan Amrabat for the increasingly calamitous Casemiro a little earlier? What might have been had Andre Onana settled quicker into life in English football. And what might have been if Ten Hag had the majority of his key players to rely upon throughout the campaign. In the case of Lisandro Martinez, the World Cup winner is not only Manchester Un…