The FF is a two-game stretch, and the MOP is only going to come from the winning team. That's a terrible metric for determining the best players.
Kennedy should have won MOP anyway. We won the championship because of the defense Jackson and Pinson played on the wing and Meeks played inside, not because Berry carried us. We hid Berry on defense because of his ankles, and our offense was generally pretty terrible - and Berry was no exception.
You can absolutely make the argument that Berry should be first-team AA. He's an outstanding player. But FF MOP is not that argument, at least not by itself.