The stubborness comes from Jim's default setting.
Hey look I'll give him credit, he gave it a valiant go this year. I was pretty happy with the way things started off. He had a center and a power forward in the game for the most part (I do not consider Posey a power forward).
But how many of us new that once things didn't go well that his answer would be this? I've said it before & I'll say it again, he can coach almost any type of way you want to play. He can coach half court slog ball or fast breaks with motion offense.
However at the end of the day he has one style that he prefers more than any other and by default he will switch to it.
Now by itself that is not really a big fault, we all have our security blankets in life. But the problem is when he does it to such an extent that he limits his other options that he becomes stubborn.
Example, you and I both know that there is/was no way in hell that Lance was getting off of that bench the other night. So why did he have to have Lance active and Solomon inactive?