In franchise mode go to create-a-player mode. Make 3 players and decrease all their attributes till they are an overall of 12(this is the lowest). Then go to Sign Free Agents and sign all three for about 1 Million. Then go back to Create-a-Player Mode and increase all their stats to maximum. You can leave them like this and use them, or you can trade them for the best players on any team. For the latter option, go to trade players in the roster menu and pick a team with a really good player and trade one or all of them for that good player, and the worst player on their team. Go back to Create-a-Player mode and decrease all their stats back to an overall of 12. Then go back to trade players menu, and trade their worst player for the players you created. Wash Rinse Repeat. You can have all the best players of the NFL that have stats like players should have.