...all of the signs and signals, it's very difficult to change everything. Waaaay more signs and plays in football than in baseball.
Plus, it's not just the signs, it's also formations, pre-snap motions, audible keys and reads.
Not only that, he also has all of the defensive plays, keys, reads and formations, so he could leak all of that too.
I mean, Detmer could just come up with a totally new offense and offensive game plan, but...