He's an interesting one. I thought he did fairly well for us when we really needed him but hasn't really featured since. We do have Timber and Calafiori now. So, I guess that, combined with his performances, is why I can understand Arsenal were looking to capitalise on selling him.
Not to mention, we also have Tierney, who is still injured. We seem to have an abundance of left backs/defenders I forgot about until this post, lol
I also forgot about Tomiyasu, who is returning from injury in the next few weeks, too, if I remember correctly.