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I imagine Ravel's servants helping with her duties as Issei's manager and arranging his schedule and also specific events as Issei will be very busy in the future. Maybe Tosca can join Ravel's peerage.
As for Rias' knight, maybe it could be the former wielder of Excalibur Blessing that was mentioned in Volume 3. He could have left the church after the Three Factions made peace which reduced the demand for exorcists. While he was offered the chance to become a Brave Saint, he refused and decided to find his own path after serving the Church for so long. He runs into Rias' and she offers to make him her knight and gives him the Galatine she received from the church.
I really don't think it matters as far as Valerie is concerned as she's barely a character and I feel that's generous. But Gasper having a peerage of very strong half-blood vampires with Sacred Gears would suit him. Kind of like how Sairaorg recruited devils from extinct houses to his peerage.
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