User blog comment:B214/Volume 23 discussion blog/@comment-31137559-20170318142230/@comment-31137559-20170318153821

These are the Rating Games. Certain limitations are put on certain teams. And less than 10% of the competitors are gods or god-class beings. Besides those gods, Issei's team, Rias' team, Vali's team, and all of the other youths' teams are exceptionally powerful. So it would make sense for there to be limits if they are fighting against other powerful teams.