Probably Kurahashimaro was invited to join the new administration due to his considerable wisdom rather than just for his family lineage, because many members of the Abe clan were sent to foreign countries as emissaries according to "Nihonshoki" (Chronicles of Japan).
阿倍氏には『日本書紀』などでも外国への使者などに派遣される人物が多く、倉梯麻呂は家柄のみならずそれなりの見識を買われて新政権に参加した可能性が高い。