Drills have several purposes. To groove in a team action is a principal one. To test a system fully. To groove in lines.
Whenever postings are changed, the new post holders have to be grooved in on their posts (hatted and on-post trained) and then the team itself must be drilled.
The two steps are always needed.
There’s a maxim about all training that applies. It is this: TRAINING MUST INCLUDE ALL THE ACTIONS AND APPROXIMATIONS OF THE ACTUAL.
This includes of course the whole cycle of an actual sequence of actions. It’s the sequence that counts.
The drilling of sequences of actions is a stable series of data that prevents chaos from overwhelming one.
This applies to org lines as well. Dummy runs and dummy bullbait runs serve as the drill.