I think a major change that happened to the quality of the first squad was the transfer of Jesus. He perfectly fits into the team and he scores constantly. He makes important goals again and again, which is what Arsenal lacked last season. Now they have a killer in their offensive game and can decide games with just a single attack.
Arsenal has been strong in both attack and defence this season. And consistently they are playing well. In 7 matches they scored 17 goals and conceded only 7 goals. But their opponents were not very strong. Despite being able to play well against relatively weak opponents, I look forward to seeing how they fare against strong teams. But I have considerable doubts whether the Arsenal team will be able to maintain consistency. I consider Manchester City as the favourite to win the title this season. The likes of Tottenham and Arsenal will slowly fall back.
Exactly, except for the game against Manchester United they haven't really been facing top teams. Conceding 7 goals in 7 games isn't amazing either. That is one goal per game on average. Especially in the top games conceding one goal can be one goal too many. It doesn't matter when you concede one and score four goals against a weak team, but making a comeback against stronger teams like Manchester City is a different story. It is not a disaster, but not amazing either.
The weeks after the current break will be more interesting. That's when Arsenal faces Tottenham and then Liverpool. If they are still able to keep winning and take home maybe 4 out of 6 points in those two games, I think that would be a moment to draw first conclusions.