(according to "Shigenki" (dated August 1, 1188), MINAMOTO no Michichika mentioned that there were cases where persons whose maternal grandfather belonged to the Minamoto clan were appointed to the betto (of both schools or of Shogakuin), and cited the name of FUJIWARA no Tasumoto and FUJIWARA no Yukinari as examples. They may have been Genji choja concurrently, but there is no firm evidence)
（なお、『姉言記』（文治4年6月30日条）には源通親の話として過去に源氏を外祖父に持つ者が院別当（両院もしくは奨学院）に補された例があり、代表例として藤原扶幹や藤原行成らを挙げている。彼らが源氏長者を兼ねていた可能性もあるが明証は無い）。