Arsenal still doesn't know how to properly use Aubameyang. They need to start playing more trough balls, so he can race defenders. They are not using his speed at the moment and that is his outstanding quality.
Iniesta is Barcelona legend and phenomenal player but this whole season he is not playing at his usually high levels. In my opinion they will miss Coutihno more because they need players which use the space Messi is opening just by standing on the pitch. That's why Paulihno has such a good season, he just runs into the places which open up when opponents double or even triple on Messi.