User blog comment:Raze1313/Issei's Future Peerage/@comment-26428542-20150617200221

I think Xenovia will be Rook, she's a power idiot, despite her skill in swordmanship and natural talent in wielding Holy Sword. Ravel and Asia will definitely be the two Bishops. Le Fay will be better as a Rook specialized in magic like Rose.

Those from Sona's peerage can join Ise's peerage through trading. Although I don't think Sona will agree as she's very careful in choosing peerage, except maybe if she find another person who suit her team better then her current member.