Mack played with a bum shoulder his rookie year. It had to hurt like a mother ever time he took a shot.
Now, he will lower his pads, he doesn't favor either side, the hits the hole and then gives it the gas. He's so much better this year.
And it's part him, part having Luck at QB, having a damn fine O line, and a D that has allowed the O to play from even or up front the last six games.
Its not one thing, a lot of little things add up.
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