20 MPG over 60 games is not cherry picking. That's 1200 minutes of basketball played at a high level. I challenge you to find an actual comparison with a teenager that played at least 75% as much.
Let's suppose that projecting from 20 minutes to 28 minutes isn't too much of a stretch.
Player A: 10.7 PPG , 10.3 RPG, 2.1 BPG
Player B: 10.4 PPG, 6.3 RPG, 1.6 BPG
Those numbers are Drummond and Garnett as rookies (Garnett played 28 MPG).
EDIT: I would rank Drummond's season as the 2nd or 3rd best ever by a teenager, after Lebron and very close with Dwight Howard. Better than Kobe, Al Jefferson, Garnett, McGrady, Marbury, and every other player I could find who had a lesser career. Am I missing anyone? Everyone in that group so far is somewhere in between All-Star and HoF. Not a sure thing, yes, but a darn good start.
EDIT2: Before the high school craze there were a few killer 20-year olds, Shaq probably being the best ever. But again I couldn't find any that didn't have pretty serious careers after that.