West Ham chief David Sullivan may need to be sitting down when he reads what’s just been said about striker Viktor Gyokeres. Hindsight is a wonderful thing in football. But it seems West Ham had plenty of foresight when they extensively scouted striker Viktor Gyokeres ahead of an expected bid. With Gianluca Scamacca sold after one season and ageing Michail Antonio entering his West Ham swansong, there was no doubt the Hammers needed to sign a striker last summer. Sweden striker Gyokeres had been widely expected to join West Ham as the perfect heir to Antonio. Especially after Coventry failed t…