User blog comment:B214/Volume 23 discussion blog/@comment-31137559-20170506225314/@comment-82.58.59.197-20170507104924

And we don't know Sirzechs' age, for what we know he could have reincarnated Souji when he was just a High Class Devil. Sirzechs right now is still not able to perfectly control his "true form", so imagine how much control he had hundreds years ago.