As Facundo Buonanotte saddled up beside Alejandro Garnacho on the advertising hoardings in front of the pocket of away supporters after the latter opened the scoring at a jam-packed Cardiff City Stadium, for a moment or two everything seemed all right in the often chaotic world of Chelsea. Then, with 15 minutes remaining, the hosts equalised through David Turnbull's sublime diving header and another awkward 48 hours were on the cards for Enzo Maresca.