Think this was answered. Set one to Training, it will randomly pick one of the others to Unlearning even if it is one you rather have Maintaining? So either play the toggle game or first set one to Unlearning so you keep the two you want? You gave examples of 2 skills, but what about 3+? Reduces the contribution of that tree to decay. Does that mean it takes the saved 7,500 in that tree and takes it from other trees?