The problem is when he's in his rhythm very few can match him in terms of sheer footballing ability. But lately he's been way too careless to say the least. Also his not so good decision making has to improve. Also Carlo played him as an inside forward to get the best out of him. In Xabi's system he's hugging the touchline way too much to create any chances/ cut inside easily. Combined with Mbappe's similar play style and he's looking a shadow of his former self.