He would probably have been a contender last season if injuries hadn't cut short his season.
When you look at his statistics, in whatever category is being measured, he is one of the most effective players in the world, not just goals scored, but his overall contribution.
The press waxed many lyrical words about how superb Suarez was last season for LIverpool, and while over the season he was the leagues best player, Aguero was way ahead of him until he got injured.
If he can stay injury free, bang in 40 odd goals for us this season, which he is well on his way to achieving at the moment, then he is in with a good shout in my opinion.