After Yoshitaka's death, Takafusa concluded a secret treaty with Yoshishige OTOMO of Bungo Province just before rise in rebellion to adopt Yoshishige's younger paternal brother, Haruhide OTOMO (his real mother was Yoshioki OUCHI's daughter and Yoshitaka's sister) in return for transfer of interests in the territory of Ouchi Family in northern Kyushu.
義隆の死後、隆房は謀反を起こす直前に豊後国の大友義鎮と密約を結んでおり、北九州における大内領の利権を割譲する代わりに、義鎮の異母弟・大友晴英（生母が大内義興の娘で、義隆の姉妹）を貰い受けた。