Board Thread:Questions and Answers/@comment-26572409-20150704135123/@comment-25121259-20150708205342

It's probably the same deal as it is with Fullbringers. IIRC, some of the Fullbringers had (younger?) siblings (like Riruka and Jackie), who seemingly didn't possess Fullbring themselves (I guess it is all transfered to their firstborns ?).