The Giants established a winning formula early on, but have not been able to continue executing it Before Thursday’s New York Giants-Dallas Cowboys game I laid out what I thought was the Giants’ narrow path to an upset of the heavily-favored Cowboys. Here is part of what I wrote: How can the Giants pull an upset of the Cowboys on Thursday? They have to play the game on their terms. They have to be able to follow the formula that has allowed them to win seven of the 10 times they have gone to the post this season. That formula…