Koulibaly, yes, whenever he played. The most physical one. The other time where we won and he had two goals he was marked by Maksimovic or Luperto, don't recall now. Probably Maksimovic.
Smalling sucks.
He was not marked by Romagnoli iirc, it was mostly Kjaer on him from Milan.
Versus Juventus he only played vs Chiellini in the last derby and he's barely played thus far and that was his first start in like 3-4 months. It was Bonucci on him the other times. De Ligt is a far better man marker. As is Chiellini of course.
I wouldn't make any mention of Glik there either. But still, he's the most physical, not the better marker.
Confirmed Brehme spends more time on his phone than actually watching the game