By Tom Gott Mauricio Pochettino delivered the understatement of the century with his admission that Chelsea’s 5-0 defeat to Arsenal was “disappointing”. Chelsea trailed 1-0 at the break after a solid first 45 minutes, but four quick-fire goals after the break, including a double from former Blue Kai Havertz, created all sorts of chaos which left Chelsea limping to the final whistle. Pochettino refused to offer any excuses for the performance, admitting Chelsea simply “gave up” when things started to get bad. “It’s not difficult to explain,” he told BBC Match of the Day. “Everyone saw we didn’t…