Forget assists and crossing, the biggest drawback is that he looks like he's playing football with an oval ball while wearing slippers.
His posture is all wrong, his passing isn't good enough and he doesn't play with the ball fully under his control. The only technique that he has that is remotely good enough for the EPL is his tackling technique.
He dribbles but struggles to get away from his man, he takes ages to get off the mark when running and when kicking the ball, he can't shoot, he can't bend a cross or a pass round an opponent, his passes tend to wrongfoot the recipent when he actually gets the ball on target, he controls the ball in a way that means he takes ages to get the ball off his foot, he runs with the ball under his foot in a way that means he can't accelerate, and he struggles to get the ball moving in a straight line.
His technique with the ball is so unorthodox and couldn't be worse for an EPL footballer. He has zero awareness of space too and is too laid back off the ball.
He is a player that should never have left Crystal Palace.