User blog comment:B214/Volume 22 spoilers/@comment-27083298-20161115021134/@comment-10330822-20161115162016

It could have been foreshadowing how Ravel mentioned you didn't have to win all your matches to advance. Meaning Issei might actually lose to Dulio. Of course, I'm not entirely convinced he is weaker than Dulio at this point in time, we'll just have to wait and see.