I agree with most of the posts above about coaching, etc. At the end of the day the Championship teams always have one guy they can give the ball to that can either:
1) Create off the dribble to get a good jump shot.
2) Create off the dribble and get to the rim.
3) If fouled on either of these, they can make their free throws.
Dwayne Wade - Miami
Michael Jordan - Chicago
Kawhi Leonard - Toronto
Kobe Bryant - Lakers
Lebron James - Multipe teams
Durant and Curry - Golden State
None of our "Big 3" fit the bill