re: when do we start blaming the coaching staff? If we don't improve next year?

Almost any player in the NBA should show improvement like GV has on a per 40 basis. If not, they aren't in the NBA anymore.

His per 36 last year read

12/8/4 on 43% shooting and 32% 3p

He's playing 34 mpg this season and averaging 14/9/4 on 44% FG and 38% 3p.

Numbers are pretty similar.

I guess Monty taught him how to shoot 3s. Monty was a career 11% 3 point shooter after all.

How much does the head coach teach? How much does assistant coaches teach? How much does a player practice on his own?

I feel like a hc's main job is Xs and Os, personnel, roster, lineups, etc.