Unless he's trying to physically take someone on, that's a non issue. At speed his close control and feints will do much more than having an Adama like physique
I'd argue that he'd fit well in the current setup. He's a midfield player with the tendency to drift to the RW. That helps occupy space in the area Messi vacates drifting deep
https://www.facebook.com/197394889304/posts/10159224792354305/?sfnsn=scwspmo&extid=iLNjGmyFvt4azGqM&d=n&vh=e
If you're a keen observer, you can see Arthur peaked as an attack minded player as a 8 yo. All downhill from there