Pep Guardiola has admitted it’s been a difficult season for one of his biggest players. Manchester City destroyed Luton Town 6-2 in an entertaining match at Kenilworth Road on Tuesday night in the FA Cup. Though there was a brief spirited comeback from the hosts, City dominated with Erling Haaland tucking away the first five goals. Kevin De Bruyne was the provider for four of them as he topped City’s assist charts with 11 in just 12 appearances before Mateo Kovacic put the cherry on top with a strike from distance. The Blues are now in the hat for Wednesday’s quarter-final draw and the dream o…