Nothing. Casemiro's defensive stats look like this:
He gets dribbled past so many times because he challenges so many dribblers. That 3.80 dribblers challenged number will almost certainly be a lot lower for all other names on that list.
For comparison I checked a couple of other names on the list:
Casemiro: dribblers challenged: 3.80, dribblers tackled: 1.70.
Rodri: dribblers challenged: 1.64, dribblers tackled 0.90.
Rice: dribblers challenged:1.33, dribblers tackled: 0.79.
So basically, Casemiro successfully tackles more dribblers than those other players even try to.