Hmm, if Yumi pairs with Fran and Estelle with Ozy, I think that leaves only Jekyll to go with Nanase from what I can tell? That's the only pairing I'd like to avoid because I don't really want to play both halves of one duo. 

If neither Vita or Rin want to pair their Masters with Jekyll, I could maybe scrap him and get a new servant CS within a day? I wouldn't mind playing a variation of the new Berserker, for example, if that interests either of you as a potential servant for Yumi or Estelle.