The name could be different of course.
The idea is to have another stable upgrade where the training points of the gladiators which no longer need them (like all these lvl 50 Olympians who earn dozens of them each day) - or for some unfathomable reason prefer to skip the training for the day - can be transferred to gladiators from the same stable who are not fully trained yet. Of course this will speed up the training of lower level fighters significantly so it needs to be balanced somewhat. For example, the training points transfer ratio could be something like 4:1 (i.e. for each 4 training points of the "mentor", the "trainee" receives 1), the training process could consume energy and the amount of training points transfered per day could be limited to a fixed, level-dependant amount (5 points for levels 1-15 of the "trainee", 10 for levels 16-30, etc.).
What say you?