User blog comment:B214/High School DxD Hero Discussion/@comment-31137559-20171031022009/@comment-1359322-20171031051003

Ise will unlock his Triana during his friendly match with Sairaorg, then on the day of the actual RG, the Hero Faction will interfere, Ise unlocks his CCQ and beats the Hero Faction decisively.

Well if they were to continue from S3, i can see this scenario happening.