David Moyes allowed one specific player to leave West Ham United in the summer of 2021, and that’s now looking like a mistake. West Ham boss David Moyes has been very much hit and miss with his transfers since returning to the London Stadium for the second time in December 2019. For every Tomas Soucek there has been a Gianluca Scamacca, and every Mohammed Kudus, a Nikola Vlasic. The Hammers manager has probably made more good signings than bad ones over the past four-and-a-half years in fairness to him. However, one of the Scot’s clear blindspots is giving up on players too quickly, and sellin…