It is quite natural to think that before the downfall of Narimasa SASSA (and thus, before the seppuku of Nobutaka), the Sassa clan, whose original fief was close to that of Nobutaka's mother's family, tried to become maternal relatives of the Oda clan, in opposition to Hideyoshi, by form a marriage bond with Nobutaka, with whom the Sassa clan had a territorial relationship and whose mother's social status was also high.
当時は佐々成政の没落前（ことによると、信孝の切腹前）でもあることから、信高生母の一族と本領が近い佐々氏が秀吉との対抗上地縁があり、生母の身分も高い信高と縁組して織田家の外戚となろうとしたと考えると自然であろう。