Doubts are already being raised about West Ham’s signing of Niclas Fullkrug and whether he has what it takes to cut it in the Premier League. It’s easy to understand why. Hammers supporters are scarred by a litany of failed striker moves down the years. And West Ham don’t even have to reach too far into the past for evidence. Be it £15m flop Danny Ings, the £80m spent on Gianluca Scamacca and Sebastien Haller before him – there’s plenty of it. The addition of Niclas Fullkrug took the number of strikers West Ham have signed since 2010 to a staggering 52. Not all have been flops or disasters. Bu…