Notice how against the Pistons, when Nate was in the game, they called New York plays. Did you see how dominant the second unit was. The Pistons didn't know how to adjust. It wasn't so much that New York has better plays, it was that Celtics broke the pattern and did something different.
I have always felt that the play calling or the approach to the game has gotten stale and predictable. By the second half, the other teams make the adjustment. Just imagine eating Salmon and Mashed potatoes every day. You become predictable,bored and uninspired.
Doc needs to mix it up, become less predictable. We simply need new plays; new attack. The other team will be off balance, and the Celts will be infused with a new dimension and new energy.