The stunning 6-1 demolition of rivals United a little over a week ago gave City a five-point edge at the top of the table.
"Five points dealt United a blow to their morale and made it hard for them," Silva said.
"Our win over them showed we are the team to beat in England. We have shown we can become champions.
"In the summer, Mancini promised us a bigger attacking system and is fulfilling what he said. I think we are creating many openings because of this strategy."