Manchester City’s match-winner Antoine Semenyo celebrates with the FA Cup Credit : Mike Egerton/PA If this is the last trophy in English football for Pep Guardiola, then the great Catalan did it his way again – a starting XI that felt wrong, this time rectified mid-match and once again too good for the opposition. The 15th major Manchester City trophy for Guardiola – 20 if you include them all, and he does – in an FA Cup final that no one will feel compelled to watch again. There was a lightning strike of inspiration from Antoine Semenyo for the match winner, which never looked less than enough. Guardiola started the game without his beguiling new playmaker Rayan Cherki and then, when he was introduced at half-time, finally City’s day came together. Semenyo, one of two transformative January signings along with Marc Guéhi, has had a profound effect on a faltering City season in which they still have a slim hope of the domestic treble. In their short City careers both already have a Carabao Cup and an FA Cup.…