There's a much more fundamental issue here.
Manu Ginobili true shooting percentage = 59.1%
Tony Parker true shooting percentage = 56.9%
Manu is more efficient scoring-wise than Tony. Why? Because he takes a lot more 3 point attempts, and 3 point attempts are worth more. If you look at total FG% alone, you are foolishly penalizing a person who takes more 3 point attempts than 2 point attempts even if that person is more efficient at scoring from the field.
Consider this hypothetical scenario -
Player A shoots only 2 pointers, shoots 50% from the field, and attempts 20 shots per game. Player A will go 10-20 in any given game and will score 20 points on 20 possessions. FG% = 50
Player B shoots only 3 pointers, shoots 40% fromt he field, and attempts 20 shots per game. Player B will go 8-20 in any given game and will score 24 points on 20 possessions. FG% = 40
People who look at field goal percentage in isolation might amateurishly claim that Player A is more efficient because he shoots "50%" from the field. But, in reality, Player A is only scoring 20 points on 20 possessions whereas Player B is scoring 24 points on 20 possessions.
True shooting percentage corrects for these value (between 2 pointers and 3 pointers) and volume (between 2 point FGA and 3 point FGA) differences.
Tony barely takes any 3 pointers per game. Nearly 95% of his shots are 2 pointers.
Nearly half of Manu's shots are 3 pointers, and he makes them at a respectable 35% clip. Of course his overall field goal percentage will be lower because he shoots more 3 pointers.
That said, the statistics clearly show that Manu is still more efficient at scoring than Tony. His true shooting percentage is higher.