The timing of when you play a team makes a rather large difference.Ourselves and Arsenal did the business against them. It's United City and Spurs who rolled over. If those 3 had played to at least a draw, well there is your 7 points.
They need a couple of injuries to level the playing field (lol, that's what everyone said about Leicester last season)
At this rate the League is theirs
Chelsea had a rocky start. Had to grind out a few results and got lucky in a few games.
City on the other hand started full of confidence.
United played both these teams in a form run. Although they did roll over to Chelsea.