By Jonathan Wilson Erling Haaland and Phil Foden each scored three goals Sunday in a brilliant attacking display, showing just how far behind Man United is from its crosstown rival. Four straight Premier League wins had raised Manchester United hopes. There was a feeling that maybe Erik ten Hag, by rowing back on his Ajax principles, could make United more competitive than had seemed likely in the first two games of the season. With Rodri missing from the back of midfield and Manuel Akanji paired with Nathan Aké at center back, there was a thought that it might be possible for United’s attacki…