If the Terminal Managers have people in training and their boss is giving them heck about he numbers, they need to remind their boss about the trainee(s). And with some math skills, they should be able to shut their boss up about the numbers. Unless the TM's numbers are bad with or without the trainees. Then that's a different argument that can't be explained away.
If the division level bosses don't realize that the numbers will suffer a bit until the trainees are on there own, they probably shouldn't be at division level either.......because they are a narrow minded dumbass.