I mean, Brands and Silva signed him primarily for his versatility and both were very clear they saw him as a winger. Quotes below.
Brands: "In our eyes, a boy that can play in different positions. Play from the side, also behind the striker. He's 23-years-old, already quite experienced and the most important thing: he has goals and assists in his game".
Silva: "The position we see him in is clear, coming from the left," said Silva. "He can also play behind the striker really well. He can even play on the right. One of the things I will be demanding from him is to start scoring more goals
"He has goals and assists in his game" - He never has, IMO. And certainly not enough to warrant the money we spent at the last second of the window.