This is just over-thought BS. Minutes on the court are minutes on the court. In fact, comfortable margin minutes are probably not as developmentally valuable as heat of battle minutes.
Will he sacrifice a W for development? Never in a million years will he consciously say to himself, - 'well, leaving this guy in the game doesn't give us the best chance to win, but it sure will help his development...'
Nor should he. Ever. Not at this level.
For my daughter's youth soccer team? Yes. For big time cbb? Never. Earn your coach's trust and you will see the floor. JB's has earned the right to make that call 1000x over. Never mind the Igorisms. As far as I'm aware, JB's never been wrong. Maybe once, and he fixed himself.. Josh Pace.