Graham tore the plantar fascia in his foot early in that New England game, and has been playing through the pain of the tear since that point. Teams have been more successful the latter half of the season by bodying up on Graham, but I'm not sure how much of that is from his only being able to plant and push off of one foot right now. Ditto with his being able to run away from anyone through the second half of the season. He's had to play since that point a lot like Tony Gonzalez has played for some years...find a soft spot and just try to box out the defender away from the ball.