His marking in defense isn't that good but he's very capable of winning aerial duels and making tackles and so on, IMO he's more than anything suffering for going too much forward at times and that habit he might have only because of the coaching or just watching Emerson and Alonso.
He's a really good talent there is no doubts about it. He picked up Willian for the first goal and he was the only one putting in crosses and cutting the balls in the box regularly, he's not that far off from Azpilicueta, he's already capable of doing most things at a high level. He's not like Moses he's simply better and he has all predispositions to become world class.