#2 He lacks creativity
As you would generally expect from any Greek defender, Stafylidis is not the greatest creative fullback in the world. He's regarded as a defensive-oriented fullback, which is seemingly growing out to be a rare kind these days.
The Greek International often looks clueless in tight spaces and is always fragile while on the ball. Unlike Philipp Max, the 24-year-old is not a specialist when it comes to working his way across the pitch with sublime passing and good link-up plays.
His lack of ball playing qualities and creativity restricts him from being a threat in the final third, apart from his marauding runs forward, of course. He's largely one-dimensional when it comes to his overall gameplay in the offensive half, meaning there's a little chance that he will prove to be a real asset for Paul Lambert's men in the attacking department.