Arsenal have better form than Chelsea but they will have to pay more attention on the opponent. Chelsea have enough good players to compromise Arsenal's weakness and mistakes if Arsenal show them in the match. In this season, Arsenal and Arteta are playing not only good in general but also good in big matches. That is good for them to keep fighting for the Premier League title.
Arsenal's only defeat in a big game, against Manchester United, while against Liverpool and Tottenham they kept perfect clean sheets, this is a breath of fresh air for Arsenal in the match against Chelsea going forward.
Tottenham in this season have worse contributions from Harry Kane and Son Heung Min. They are getting older and be affected by the coming World Cup. Only about 20 more days until the World Cup and star players like them don't want to miss it.
Harry Kane and Son Heung Min weren't too bad in the matches they played, it's just that this year the contribution of the two players you mentioned is different, but not as bad as you describe.
Injuries suffered by Richarlison, Kulusevski and Romero, made a big impact on Tottenham's journey.
Nunez is improving and that is good for him as well as Liverpool. He still made some bad decisions, missed some opportunities but with improvements, at least he gives us belief that he won't be a failed transfer for Liverpool.
In fact, I saw that Nunez was not optimal at Liverpool, he was difficult to adapt and was too slow to accept the instructions given by Jurgen Klopp, so that currently entering week 12 Nunez has not made a real contribution to the club.
Mane departure actually has very negative impact on Liverpool operation generally. Klopp is still struggling to fix that hole by other players and by other formations.
Failure to understand the needs of players in the team, even if there are other reasons that made Mane leave Liverpool, at least this is a decision that was not right by Jurgen Klopp, even though Mane was an important player in the previous season.
Mane's contribution is definitely better than Nunez's, both in the Premier League and in the Champions League. While Mane has developed so much at Bayern Munich, for me this is a huge failure after releasing Mane to another club for Liverpool.