There is a reason they play the game. And let's face... it to beat Billy-cheat, you have to throw a curve (I mean he already has your signals).
I hardly think the Mia-NE wildcat game was just the Miami game plan for the next opponent. My guess, that plan was hatched the previous May, if not earlier; practiced, perfected, and unleashed on the perfect opponent.
Billy-cheat is such a pompous ass, he makes the French seem polite. (I just had to add that, I truly despise the man's character).