Without us being involved in major D1 college programs, we’re just speculating.. but I would think playbooks and the signs associated with them are implemented all during the offseason with maybe minor adjustments throughout the season. Everyone needs to be on the same page for seamless and flawless execution.
Redoing your entire sign language MID season doesn’t sound feasible. I could be wrong, but to me seems logical
As for TCU, didn’t they have a whole month to prepare? That’s a lot different than having one week during the season.