Manchester City will still be superior because they will next meet several opponents which in my opinion are easy to beat and will make Manchester City get additional points easily, As for Arsenal, they still need to work hard to win and of course it's not easy for Arsenal to do that, but in the end Arsenal have managed to take first place for a while.
This is the best Arsenal can do, by January ending I doubt Arsenal will still be topping the table. Also lets not forget that Chelsea is cooking up something, they are going to be active in the January transfer market buying players. Already there are impressive news of some quality players the board is looking to acquire their service. Chelsea should join the conversation of who wins the title by January ending as well.
Arsenal should just lose eyes on the title and focus energy on playing champions league football next season. Jesus Gabriel is injuried already and there's no one in the team that contributes to arsenal game like Jesus. He mightn't score or give assist but involved in must build up to goals in a game he plays. His presence will be missed and that'll make arsenal the drop form.