Let's take a look at the Warriors' assistant coaches since Steve Kerr arrived prior to the 2014-15 season:
2014-15 -- Alvin Gentry, Luke Walton, Ron Adams
2015-16 -- Luke Walton, Jarron Collins, Ron Adams
2016-17 -- Mike Brown, Jarron Collins, Ron Adams
2017-18 -- Mike Brown, Jarron Collins, Ron Adams
2018-19 -- Mike Brown, Jarron Collins, Ron Adams
As you can see, there hasn't been a single change in three seasons.
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Additionally, player development coaches Bruce Fraser, Chris DeMarco and Willie Green have been on staff for several years.
Why does this matter?
California Sunday Magazine recently published a conversation between Kerr and legendary head coach Phil Jackson, and check out this one notable exchange between the two:
Jackson: "Have you made any additions to your coaching staff, Steve?"
Golden State Warriors
Kerr: "No. We haven’t had much turnover at all the last couple of years, so that’s a concern as well. I think we could actually use a little bit of a change in that regard, but you can’t always dictate that."
While NBA teams want consistency, sometimes a fresh voice can help. Change in the coaching ranks also means talented people are being promoted, even if that means going elsewhere.