I beg to differ, but it doesn't matter, either way. Even if I were to stipulate that Kerr deserves credit for Golden State's success (and I don't), whatever Kerr may have done for them during the 2014-15 season has proven to be self-sustaining at this point. His loss may have qualified as an "unfortunate circumstance" three years ago, but it didn't last year, and it doesn't now, and their record is the proof.
In 2016-17, Draymond Green is ostensibly the head coach of the Golden State Warriors.