Five key observations as Manchester City beat United at Old Trafford

Manchester United's shaky home form continued as Manchester City inflicted further pain on their bitter rivals with a 3-0 win.

Silva terrorised United throughout

Surely the most effective playmaker in the Premier League, David Silva gave another masterclass at Old Trafford with his ball carrying, movement and neat passing. Pundit Gary Neville commented during the game that United had employed three central midfielders to keep track of the Spaniard, yet even that couldn't interrupt his influence on the game. His driving run into the United box led to Dzeko's first goal, and the former Valencia man barely put a foot wrong as he led his side to a famous three points.

Demichelis is the one weak link in this City side

One player to emerge from the game with little extra credit was Martin Demichelis. Stepping up at the wrong time, and far too liable to make a mistake or get exposed by a quick break, the Argentine continues to look like the vulnerable part of a strong City side. He may be a Pellegrini favourite, but a genuine quality partner for Kompany could make this a near-unbeatable team, and the Chilean should be prepared to spend big to get someone of that level.

Is Vincent Kompany the best defender in the league?

On the flip-side, Demichelis' partner Vincent Kompany was a hugely impressive figure once again for the visitors. Powerful and authoritative in defence, the Belgian also showed his class at times when bringing the ball out of defence. On one occasion the City captain took the ball to the edge of the United area, laying it off to a teammate and breaking into the box, when his side lost possession he was able to win the ball back as he returned to his defensive position. There can't be any better Premier League defenders than the Manchester City number four. 

Dzeko proved he is worth keeping

There has been plenty of talk of Manuel Pellegrini letting the Bosnian leave the Etihad come the summer, and unsurprisingly, there is no shortage of mooted suitors. With his brace at Old Trafford, he continues his best ever season at the club, and with 20 goals in 39 games, many of them in key matches, Dzeko has to be worth keeping. Any other player brought in would be a risk, and as Spurs have shown with Roberto Soldado this year, bringing in a proven striker for over £25 million doesn't guarantee you a top class Premier League forward.

This signals a genuine power shift in Manchester

As if the city's citizens needed confirmation as to the huge shift that has taken place this season, Tuesday's impressive 3-0 win for the Sky Blues really emphasised that this United side is a very different outfit and will struggle to contest big games unless changes are made. That they failed to raise their game for the local derby on their own turf will have really hurt Reds fans, while City supporters can revel in the fact that gone are the days of looking up to Sir Alex Ferguson and co. They are the dominant team in Manchester, and may be for many years to come.

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