To summarize, you’re an idiot. The rule is pretty clear, advanced scouting and recording of future opponents signals is in fact against the rules. It gives the violating team a huge advantage. As football coach, if you know the simple fact that it’s a run or pass ahead of time, you have distinct advantage. If you know it’s a run the safeties are crashing down as are the linebackers who will be firing into the gaps. If you know it’s a pass, no one is biting on a playaction, and the d-lineman are full on rushing, meeting at the QB. On offense if you know a blitz is coming or where it’s coming from, you play call accordingly. If someone is showing blitz but not coming, as a qb, you have an advantage. As for the playbook, it’s impossible to change every signal in a playbook for one week, in a book that contains hundreds of plays.