I don't know if he would be terrible but he wouldn't be one of the best at his position. Let's look at it from another position. Kyle Arrington for the Patriots is a very good slot CB, when he plays on the inside he is shut down, when they move him to the outside and he plays out of position he is one of the worst CB's in the NFL due to lack of his speed. Madden schemes should have something to reflect guys playing out of position but often times it doesn't. Just like I can line Wes Welker up at X receiver and he plays the same. That was the main problem with schemes, while they did help you to organize your roster and find free agents they had no real effect on the game.