the biggest knocks against drummond were work ethic, lack of motor and lack of offensive skills. Plus, he was widely considered the most likely to be a bust.
There's a reason he slipped to 9, and it remains to be seen how effective he will be when he starts playing long minutes. I remember how CV slipped to us in 2005 because of similar concerns about his work ethic and then we went on to have a great rookie season only to regress to the point he is now. The league is full of extremely gifted athletes who end up going nowhere because they don't improve their games.