There is a view that Ieyasu endeavored to decrease the power of the Toyotomi family immediately after Hideyoshi's death (more precisely, after the death of Toshiie MAEDA) and the general public accepted this and many daimyo who enjoyed the kind favors of the Toyotomi family joined the Ieyasu's side is evidence that such double dealing had gone around already at that time.
家康が秀吉死後（厳密には前田利家死後）すぐに豊臣家の勢力を削ぐことに傾注し、また、世情がそれに従い関ヶ原の戦いにおいて豊臣恩顧の多くの大名たちが家康側についたことも、当時既にそうした疑念が広まっていた傍証であるという考え方もある。