You guys know City a lot more than I do, but from an Arsenal fan that wants to sign Jesus, his is what I fear could convince him to stay.
Obviously signing Halaand & Alvarez increases the competition for all the forward players so you can see why these guys especially are questioning their future roles with 12 months left on their deals.
However, I think if Jesus is happy with his role on the right side which by all accounts is his preference, then from the outside I'd say Mahrez at 31 seems the most obvious candidate to leave, and you guys also seem open to Sterling leaving as well. The main concern about Sterling of course if who can afford to pay a large transfer fee & his large wage.
Think that's the way Jesus can be convinced to stay. Unless somehow, Edu has convinced him he'll be front and centre at Arsenal & the attack will be built around him & he fancies that challenge, but that flies in the face of him being happier on the right.