Is a head coach not responsible for anything anymore??? Isn't it Antoni's job to make this talented team work on all levels? The coach has the duty of knowing his roster and making the pieces fit for maximum success. He has his PG now, so all indications based on the Antoni lovers is that his "system" will work.
There are plenty of coaches would love to have this roster. If you can't make Melo and Amare work then you don't deserve to be the coach.