the best LB of the previous generation, Marcelo, basically picked and chose matches he cared to defend in. A great attacking fullback (left or rightback) can unbalance and overwhelm an opponent. And it makes your attack much less rigid and more unpredictable. It’s a gamble because when you lose possession and you’re upfield you can be exploited, but if you have a good defensive midfielder and CB in the squad they’ll be able to help cover the gap. Something that I’m not sure Davies has yet in his game that Marcelo had was the ability to loft a pinpoint cross through the air. If he adds that then forget about it.