As i said on the other thread:
Man City's biggest winning goal margin this season is 6 (Watford); they've also won by 5 goals against Liverpool, Palace, Stoke and Swansea. Their average winning margin is 2 goals.
Of course Swansea also have to deliver on their side: they've not scored in the past four games, are the joint lowest scorers in the league and actually concede two goals for every goal they score, though they did beat West Ham by three goals earlier on in the season.
Freak events do occur -hell clueless Dalek's prediction of 17th might be correct for once; but a 10 goal swing is beyond even that pale.