Dontari Poe is the difference maker this year on defense, no question.
He took a decent defense with too much talent and anchored it. Now we're playing at optimum efficiency.
My vote goes to Alex Smith. He has been instrumental in changing the culture here, in the huddle, in his passes to 8 different receivers a game, he's had a short memory when we needed him to, he's made the offensive line look better, he's given us an extra threat on the ground, and he's made smart decisions for four straight games.