I assume the 13 players listed are for different sets: 2 backs, 4 wide, or empty backfield...etc.
Here is the defensive page, the biggest differences are Jahron Manning is listed as the starter at the 2nd safety spot, not Hunter Washington, and Jalen Smith is listed as a starting linebacker over Nic Mitchell. These changes (with the offense ones) pretty much answer all of the complaints from today's thunder & lightning show except for some of the defensive line ordering that they brought up. The defensive line ordering might be as much rotational as anything else, i.e. who they feel complement each other.
