Man city in 13th position, no, Guardiola is losing momentum, and the worse thing to happen to a manager is lose momentum. Do you think he'd do everything in his power to win Man U on Sunday - next game? What if he fails? City will fully be in a bad shape. Nobody could tell Brighton would beat them 2:1. This is the beginning of season, quite fine, but the way one begins a race can aswell justify the end of that race.
Arsenal is fine, the only trouble was that they met Liverpool earlier this season, they would have secured a 3 point was it to be a different club. However, I do think the cityzens have too much work to perform to change their fate in this season. Nobody is happy with how they just began.
Did you see how Pep Guardiola went last season? He lost momentum to get his team into the Champions League places, but slowly Pep Guardiola managed to turn things around and eventually qualified for the Champions League. The title race might not be easy for Pep Guardiola this season, but I'm sure he's capable of putting pressure on both Liverpool and Arsenal.
This isn't a major issue, as every team will eventually face a Premier League match, whether they face a stronger team or not at the start of the season. I think the overall picture of which teams will compete for the title will be clear after the second half of the season, as it's still too early to judge those chances, although Liverpool may be the favorite.
Not only Pep Guardiola but Manchester City as a club are beginning to lost momentum, I think it's an era coming to an end because for Manchester City to seat in such position in the beginning of a season means that something is not right some how, if I'm to be Pep Guardiola I'd take a shot break to cool off the tense.