Q: Why can't I move a player between offense and defense? I have a great running quarterback - why can't I move him to running back.
A: The ability definitions change depending on the set of positions. For example, passing means the ability to throw the ball for a QB, the ability to catch the ball for a non-QB offensive player, or the ability to defend the pass for a defensive player.
Q: Why don't you use the NFL's tiebreaker system?
A: The DEL pro football simulation is one of nine games on the site, each of which has its own tiebreakers. In addition, college conferences frequently have different tiebreakers from other conferences. Keeping all of these perfected would be too much to keep track of, so DEL uses a simplified system.