Not buying Cesc was a huge mistake for Arsenal.
Cesc never should have left in the first place, but he did and we eventually filled the hole he left behind.
We just bought Ozil a year ago and Ramsey finally started to become world class. We also have a squad with Wilshere, Rosicky, Cazorla, and Chamberlain.
Our #1 problem was striker, and we got both Sanchez and Welbeck, with Walcott almost fit. Our #2 problem (and this one is massive) was defensive midfielder, and we failed to get Carvalho, failed to get Khedira, and ended up with nobody.
This is why we aren't doing so well. We should've broken the bank and gotten Carvalho, not Cesc. Maybe then we would've been doing a bit better.