1. In order for a player to block a shot, he must attempt to block a shot.

2. It is not likely that a player will have a 100% success rate on block attempts. Therefore, if a player blocks X number of shots, he must have some number of block attempts greater than X.

3. When a player tries to block a shot and misses the block, we still say he "contested the shot."

4. It stands to reason that the best shot blocker in the league would also rank among the best at contesting shots.

5. Derrick has the highest block rate among players at his position; therefore, he is one of the best at his position at contesting shots.

6. We say someone is "elite" at something when they are among the best at it. 

7. Derrick is an elite shot-contesting PG.

8. Derrick is 5th among PGs in grabbing defensive rebounds.

9. Derrick is an elite defensive rebounder.

10. Derrick has the 4th lowest foul rate among PGs.

11. Derrick is elite at not fouling opposing players.

12. Shooting defense, defensive rebounding and limiting fouls constitute 75% of the defensive Four Factors. If a player is elite in these three areas and even approaches average in creating TOs (the final Four Factor), that player is likely an elite defender.

13. Derrick is 23rd in STL%, which puts him at the very bottom of average or at the very top of below average.

14. See 7, 9, 11, 12 and 13.

15. Conclusion: Derrick Rose is likely an elite defender.