User blog comment:B214/Question and Answers/@comment-162.202.198.72-20140124095446/@comment-1359322-20140124101035

Millicas is showing more potential than Rias, anyone that read about Millicas in Volume 13 would feel that way. Even Issei and the others (except Rias) are shocked by how much potential Millicas showed.

He is at least on level with Issei and the others prior Volume 5.