Hate to say if, where does he play?
We can't have the paper thin sides of before.
At the base of midfield it has to be Ramsey + another. I'd prefer Flamini or another DM like Schar. Otherwise the larger teams **** us.
If we bring Cesc, we switch Ozil right wing (presumably he was told he'd get his favoured position) and Cesc behind a nippy striker. Where does this leave Walcott, Gnabry, Podolski and Cazorla? Perhaps as a three man midfield it works but at the expense of everyone else. 30m for cesc plus a conservative 25-30m wages could be better spend on a world class DM we actually need. Only way it works is if we either sell Ozil, he is okay with playing RW, or we switch to a 3 man midfield.
Let's say Aurier is costing 10-15m, a striker/winger like Remy 15m, Cesc for 30m. That's 60m gone before starting the hunt for another striker, a DM and a centre back. Doable? Sure. But doesn't feel like Arsenal to me.