User blog comment:Piyush Banerjee/Shin DxD 2 discussion/@comment-41.13.20.174-20181224141815/@comment-2601:87:8300:20D0:D54E:21E2:E9FD:204B-20181227222115

You answered your own question this is a RG or team battle and it seams the finals are just beat the king rule. That's why he won against Zeno because the king was no one special nothing  compared to the super devils. You can't deny that wasn't the case. You already say it's unfair for Mao class to enter. I think your underestimating Issei or the authors plain of thought and by your logic Issei would loose even time. How many times has he beaten people who have more experience then him. He already lost once to him, but he's gotten much stronger since then and he's ready for that rematch. Just you wait like how with Rias. I believe like HA!