As Tommy has been saying for years, "Run, run, run!"
Against the Pistons the Celtics are so much better when they run. It starts with Perk or KG getting the defensive rebound, outletting to Rondo, who is running with Ray (we all saw that play last night in Game 5). This gets the entire team easy shots, particularly Ray. It also stops Detroit from setting their Defense, and off a made basket the Celtics can set their D. When we run, we win. Plus, when we run we don't have to deal with their ball pressure.
The game is that simple.