User blog comment:B214/Volume 23 discussion blog/@comment-31137559-20170415054322/@comment-31137559-20170415173703

Well Rias is overpowered, but her main trait as a king doesn't lie in how powerful she is, but the powerful servants she has gathered. She can't fight people like Issei, Vali, Sairaorg, Dulio, Tobio, and Cao Cao on equal footing. She couldn't even face Diehauser. When she has Rating Games against Riser and Sairaorg in the future, it's Issei that's going to be the one to take them down as her pawn, not Rias. A Rating Game doesn't necessarily mean that it's going to be a battle between kings at the end that decides the match.