"We knew he had power and movement which would suit the Premier League. He's scoring goals, playing well and his understanding with the others is really good," said Benitez about his compatriot.
"We already knew he was really strong and he will be even stronger in a few months as well. He's working really hard. When you talk of strikers you can have someone who gets 20 goals a season but is just waiting for chances. If you have someone who gets 15 but creates 10 or 15 for the others, it's better.
"I always prefer to have four, five or even nine different players scoring the goals rather than just one or two.
"It's easier for defenders if they know they just have to control a couple of players who are going to score.
"Having so many players is a problem but one I prefer to have rather than having to play with the same strikers all the time, because I have confidence in the others."