User blog comment:B214/Question and Answers/@comment-24248485-20140103094808/@comment-1359322-20140104042215

I never said that Rias couldn't become stronger or use the Power of Destruction in other ways, but it is impossible for Rias to reach Sirzechs' level. Even Millicas has shown more potential than Rias in his current age, that's how much talent Rias needs to reach Sirzechs' level.