Putting this theory aside for the moment, perhas they had become vassals of Toyotomi only after have first resisted him with arms, unlike the other daimyo, the fact that there were a number of excessive demands made upon the Shimazu clan, such as the construction of Daibutsu-den (the Great Buddha hall) of Hoko-ji Temple, that they were ordered to immediately dispatch troops to Korea, and that there was an incident in which Yoshihisa was ordred to execute Toshihisa by Hideyoshi because of the Umekita Uprising (an uprising by a retainer of the Shimazu family, Kunikane UMEKITA), leaving him no choice but to comply, show that Yoshihisa and other members of the Shimazu clan were at odds with the Hideyoshi administration.
この説はともかく、他大名と異なり豊臣秀吉に抗戦した後の降伏・臣従という経緯であったためか、島津家には方広寺の大仏殿建立など過大な負担が要求されることが多かった上に、矢継ぎ早に朝鮮出兵への命令、更にその時に起こった梅北一揆で歳久が一方的に秀吉に処罰を申し渡され処刑せざるを得なかった事件など、義久はじめ島津家臣団と秀吉政権の間に確執があったのは事実のようである。