The Warriors don't have a young roster though.
The only young players are Wiseman, Poole and Mannion.
As it's been mentioned, Poole is better after being in the G-League and has shown a lot of strides, particularly as a shooter. Who knows if Mannion will even be in the league in a couple of years time. So, essentially, this all comes back to Wiseman, does it not? Kerr really hasn't had the chance to develop any noteworthy talent to say whether or not he can or I can't. And I mean, if these young players can't get better under the tutelage of Steph and Draymond, then it's probably less to do with coaching or the players already established in the system, and more about the young players simply not being good enough.
There's nobody better to learn defense from than Draymond, and yet Wiseman is a lost cause on that end.