Something emerys recent games have highlighted is just how important athleticism is.
When you see the speed and quick movement of many players, especially if you like to play higher up the pitch, you need the recovery speed, but also turn speed etc in our defensive line, one reason I think emery will like Carlos, Co patent on the ball but rapid also.
When you have players like Zaha, Bailey, sarr etc etc, their ability to break at speed can really carve teams open.
I hope we buy a similar type player for our right side so we have genuine athletic threat on both sides of the pitch.
Tbh I would also like to see a forward in a similar mould, the ability to break at speed with our front line means teams are much less likely to be able to pin you in your half, and are generally scared to over commit forward as you pose such a risk on the break.