User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-12.96.67.34-20180613212019/@comment-10330822-20180620063516

It's kind of a fantasy to think they will all get the chance to actually face him. Especially when there are Super Devils (possibly Dragon God-Class), Satan-Class, and Gods among the competition.

Chances are two, maybe three, are actually going to get to fight him. 16 teams, elimination matches, would be three wins to make it to the finals, and four to actually win. Odds are Rias will be one of those three and Issei and Vali might be the last match, meaning there is only really two openings for Issei's "rivals" to fight him.