I also think de Bruyne is a very special player. But even without him, Manchester City win their matches. Manchester City have a very large and very high quality squad. They brought the best players in the world to the team and the best manager in the world is coaching them. The absence of a player is not felt. However, if 5-6 players are missing at the same time, there may be a problem. Apart from that, they have very solid rotations. For a team that plays around 70 matches a year, it's important to have strong squad depth. Manchester City management does this planning very well.