"It was clear last season that Steven scored 23 goals and made many assists, and he did it from the role we are now playing him in," said Benitez.
"He is nominally starting on the right, but he is mobile and can attack from various positions, left or right, and that worries teams because they do not know what to expect.
"Steven is a player who can produce his talents from all around the pitch, and that is the essence of what he should be doing.
"If he is on his game and working like this he can be frightening for opponents, he has such drive and strength to get forward.
"He is unstoppable. I like that word, it is a good way to describe Steven when he plays well, and we are now seeing this more often."