Why did Giants play their likely No. 2 RB so much?

Here are three takeaways from the Giants’ 31-29 preseason-ending win over the Patriots on Thursday night:

1. Wayne Gallman is, presumably, the No. 2 running back behind Saquon Barkley and locked into a roster spot. Why, then, was he running the ball in the second quarter and then in the third and fourth quarters (He scored a touchdown, powering in on a 6-yard run, with 13:27 remaining) after Paul Perkins, a player on the bubble, started the game?

2. Mr. Reliable, Golden Tate, started and made an over-the-shoulder catch for 23 yards in the first quarter. It will be tough for the Giants to say goodbye to Tate but they must, because he is suspended for the first four games and cannot be seen in…