I don't think it is really necessary to be overly concerned with your team's specific category needs in the early rounds of a roto draft. Take the "best available" guys. If you have a deficiency in a category like steals, you can address it with mid-season trades. Don't reach in the draft.
"All opinions are not equal. Some are a very great deal more robust, sophisticated and well supported in logic and argument than others."
— Douglas Adams (1952-2001)