Manchester City are not invincible this year. In some games, they didn't seem so dominant and strong.
Liverpool is in some kind of mild crisis, they have already won a lot of games after the turnaround. Sometimes they showed quality, and sometimes they just had a lot of luck. This cannot last forever. (the last match against United showed just that)
Arsenal is not good when it comes to keeping first place, they showed that last year. We will see if that experience will help them this time.
Agree. It indicated that Man City is no longer as strong as the last season. They could lose some points in few matches, they played in the match with average stats. For Liverpool, they have a problem with injury problem. Some players got injury for a long time, that sometimes make Jurgen Klopp to use substituted players. Luckily, Liverpool has a big squad, they have many talented players.