I believe this was part of the issue Saban had with Kiffin in the Washington game. You go in with a package of plays for each game and you rarely run or don't run plays that were not in that week's package.If you practice certain plays all week, you run those plays. You are not totally tied to them, but you risk mistakes if you start calling plays that have not been practiced in weeks. In the NFL, the entire playbook is available every week. At the college level, the playbook is much more limited on a week to week basis. So you are correct, but so is Intl - it is a risk, and it can result in a loss if the other team really plays well on defense.