You are right,Arsenal is one team that has been a thorn in Mancity's flesh recently,they really pushed Mancity last season,stressing them to the aspect that City needed to win all their matches for them to win the league, because Arsenal were following them so fiercely and anything that made City drop points towards the final five games to the title,then the premier league Titttle would ha e been for the gunners.
Arsenal are really trying as much as they could to strengthen their squad in this summer transfer window because they are really aiming to take the premier tittle from City who have been champions for many years now.
Arsenal making City be uneasy is true but they didn't get the job done and I believe that the squad was ready as of last season because they have every department ready to play and the bench was full covered by better replacement which was what Arteta was lacking when he first took the job but seeing them the way they were last season you'd say they are good to go. What made the Gunners not to finish the job last season was lack of consistency, if you are always getting a win, at least get a point I believe you can win the league but when you drop close to 9 points in a month you don't expect the other team to also lose too, that's what stopped the Gunners from winning last season's title.