Out of above 5, I think RVP and Aguero have a best chances of getting the golden boot.
The reason I excluded Rooney is, his role has been revised but not changed. He is now playing behind striker finding the gaps and making a move rather than taking shot by himself.
Torres might fancy a chance reaching close to it but I reckon he will miss by very thin margin.
I would be more than happy to see if any surprise package comes from nowhere and brags the Golden Boot!