Funny when i read this kind of stuff. Stotts for the Blazers has actually hovered around .600 not 500
His first year they missed the playoffs understandably. .402 with 33 wins
then he catapulted to 54 wins and has not had a losing season since although they did have a 41-41 season the year after LaMarcus left.
.659 .622 .537 .500 .598 and last year .591.
This year on pace for over .570
Saying Stotts has been a .500 coach would be correct if you added his first and second jobs in Atlanta and Milwaukie only. As far as the Blazers go he is .556 which is much better than the 500 offered.
https://www.basketball-reference.com/coaches/stottte99c.html