According to "Chuyuki" (a diary written by FUJIWARA no Munetada), however, the letter written by FUJIWARA no Motoie (Mutsu no kami), an officer of local government in Mutsu Province, said the fact that Tsunekiyo's son FUJIWARA no Kiyohira was under suspicion for attempting to launch a battle in June 1092, the previous year of TAIRA no Mototae's attack, and consequently, there is a view that they were related and Morotae and his son might be the child and grandchild of TAIRA no Kunitae, who was the great uncle of Kiyohira.
だが、『中右記』によると、前年の寛治6年（1092年）6月には陸奥国国司藤原基家(陸奥守)の解文により、経清の子藤原清衡に合戦の企ての嫌疑がかけられていることから、両者を関連づけ、この師妙親子を清衡の大伯叔父である国妙の子及び孫ではないかとする見解がある。