User blog comment:GinIchimaru/The Zero Squad: Reality vs Speculation?/@comment-1393830-20100413021507

Actually, most of the invasions and threats to soul society seem to be minor that squads can handle on their own without the need for their captain usually. The hollows that have broken through seem to be rather easily taken care of so I dont think they do much in the training department. However, training and sparring with other captains is sure to make you grow very strong. They will never plateau because there will always be some captain who is the strongest and when someone rises above them, after a long time of training, a person will surpass them. I think this type of training is better than active duty in soul society