It may have been a display much improved from that aberration at Crystal Palace. But when the biggest positive Manchester United can take is that they didn’t suffer another battering, Arsenal limited to just the one goal at Old Trafford, then you know things have gotten pretty bad. This, Leandro Trossard profiting from yet more sloppiness from the surely Saudi-bound Casemiro, was the Red Devils 14th Premier League defeat in a season which has broken all the wrong records But if we are to pick out a few positives – the phrase ‘scraping the barrel’ comes to mind – then a lively display from Amad…