Adrian has done well at PSG. If Arsenal signs him, we can have a big and feared midfield with Xhaka similar to Vieira and Petite. They both can pick intelligent passes, both good in the air, and great in defense. This can show Coquelin out maybe because of his lack of defense has been exposed (Ex: Robben's goal, Hazard goal, etc). He is at a young age so will be a potential investment to play.