Manchester United’s goal difference finally moved into positive numbers during April’s 4-2 win over bottom-of-the-table Sheffield United. It didn’t last long. Monday’s 4-0 loss at the hands of Crystal Palace puts Erik ten Hag‘s beleaguered side back below zero and as far down as minus three with only a trio of Premier League games remaining. This Manchester United side has now conceded their most goals (81) since 1977 in all competitions. With that in mind, there are few clubs United fans would like to see rock up at Old Trafford less than Mikel Arteta’s title-chasing Arsenal. The free-scoring…