Historically, it’s very unusual to win a championship with a coach who has ever been fired.
The last NBA head coach to win a championship after having been fired as an NBA head coach at some point during his career was Chuck Daly, who won championships with Detroit in ’89 and ’90, after having been fired by Cleveland during the 1981-82 season. He was hired mid-season that year, coached 41 games, and was fired before the end of the season.
If you disregard Daly’s firing, since he was never really given a chance and was fired by the most famously idiotic owner in NBA history (Ted Stepien), it hasn’t been done since Lenny Wilkens coached Seattle to a championship in 1979, after having been fired by Portland at the end of the 1975-76 season.
In the quarter of a century that has transpired since Wilkens won:
* Greg Popovich has won two titles in his first NBA head coaching position.
* Phil Jackson won six titles in his first NBA head coaching position, quit, then won three more in his next position.
* Rudy Tomjanovich won two titles in his first NBA head coaching position.
* Chuck Daly won two titles in his first “real” NBA head coaching position.
* Pat Riley won four titles in his first NBA head coaching position.
* K.C. Jones won two titles in his first NBA head coaching position.
* Billy Cunningham won a title in his first NBA head coaching position.
* Bill Fitch won a title in his second NBA head coaching position. His first position was with Cleveland; he quit when Ted Stepien purchased the team.
* Paul Westhead won a title in his first NBA head coaching position.
So there.